diff --git a/builder/data/etc/systemd/system/pwnagotchi.service b/builder/data/etc/systemd/system/pwnagotchi.service
index c0071f3ef..84287c508 100644
--- a/builder/data/etc/systemd/system/pwnagotchi.service
+++ b/builder/data/etc/systemd/system/pwnagotchi.service
@@ -10,6 +10,8 @@ PermissionsStartOnly=true
 ExecStart=/usr/bin/pwnagotchi-launcher
 Restart=always
 RestartSec=30
+TasksMax=infinity
+LimitNPROC=infinity
 
 [Install]
-WantedBy=multi-user.target
\ No newline at end of file
+WantedBy=multi-user.target
diff --git a/pwnagotchi/__init__.py b/pwnagotchi/__init__.py
index dfd41678f..89fe3fee0 100644
--- a/pwnagotchi/__init__.py
+++ b/pwnagotchi/__init__.py
@@ -1,12 +1,12 @@
-import subprocess
 import os
 import logging
 import time
 import re
+
 import pwnagotchi.ui.view as view
 import pwnagotchi
 
-version = '1.4.1'
+version = '1.4.3'
 
 _name = None
 
@@ -27,17 +27,17 @@ def set_name(new_name):
     if new_name != current:
         global _name
 
-        logging.info("setting unit hostname '%s' -> '%s'" % (current, new_name))
+        logging.info("setting unit hostname '%s' -> '%s'", current, new_name)
         with open('/etc/hostname', 'wt') as fp:
             fp.write(new_name)
 
         with open('/etc/hosts', 'rt') as fp:
             prev = fp.read()
-            logging.debug("old hosts:\n%s\n" % prev)
+            logging.debug("old hosts:\n%s\n", prev)
 
         with open('/etc/hosts', 'wt') as fp:
             patched = prev.replace(current, new_name, -1)
-            logging.debug("new hosts:\n%s\n" % patched)
+            logging.debug("new hosts:\n%s\n", patched)
             fp.write(patched)
 
         os.system("hostname '%s'" % new_name)
@@ -109,7 +109,7 @@ def shutdown():
 
 
 def restart(mode):
-    logging.warning("restarting in %s mode ..." % mode)
+    logging.warning("restarting in %s mode ...", mode)
 
     if mode == 'AUTO':
         os.system("touch /root/.pwnagotchi-auto")
@@ -123,7 +123,7 @@ def restart(mode):
 def reboot(mode=None):
     if mode is not None:
         mode = mode.upper()
-        logging.warning("rebooting in %s mode ..." % mode)
+        logging.warning("rebooting in %s mode ...", mode)
     else:
         logging.warning("rebooting ...")
 
diff --git a/pwnagotchi/agent.py b/pwnagotchi/agent.py
index 1cdf3bf0c..b5e2d2f54 100644
--- a/pwnagotchi/agent.py
+++ b/pwnagotchi/agent.py
@@ -212,7 +212,7 @@ def get_access_points_by_channel(self):
             ch = ap['channel']
             # if we're sticking to a channel, skip anything
             # which is not on that channel
-            if not channels and ch not in channels:
+            if channels and ch not in channels:
                 continue
 
             if ch not in grouped:
diff --git a/pwnagotchi/automata.py b/pwnagotchi/automata.py
index d4e008fea..d087c4711 100644
--- a/pwnagotchi/automata.py
+++ b/pwnagotchi/automata.py
@@ -12,19 +12,18 @@ def __init__(self, config, view):
         self._epoch = Epoch(config)
 
     def _on_miss(self, who):
-        logging.info("it looks like %s is not in range anymore :/" % who)
+        logging.info("it looks like %s is not in range anymore :/", who)
         self._epoch.track(miss=True)
         self._view.on_miss(who)
 
     def _on_error(self, who, e):
-        error = "%s" % e
         # when we're trying to associate or deauth something that is not in range anymore
         # (if we are moving), we get the following error from bettercap:
         # error 400: 50:c7:bf:2e:d3:37 is an unknown BSSID or it is in the association skip list.
-        if 'is an unknown BSSID' in error:
+        if 'is an unknown BSSID' in str(e):
             self._on_miss(who)
         else:
-            logging.error("%s" % e)
+            logging.error(e)
 
     def set_starting(self):
         self._view.on_starting()
@@ -58,7 +57,7 @@ def set_lonely(self):
     def set_bored(self):
         factor = self._epoch.inactive_for / self._config['personality']['bored_num_epochs']
         if not self._has_support_network_for(factor):
-            logging.warning("%d epochs with no activity -> bored" % self._epoch.inactive_for)
+            logging.warning("%d epochs with no activity -> bored", self._epoch.inactive_for)
             self._view.on_bored()
             plugins.on('bored', self)
         else:
@@ -68,7 +67,7 @@ def set_bored(self):
     def set_sad(self):
         factor = self._epoch.inactive_for / self._config['personality']['sad_num_epochs']
         if not self._has_support_network_for(factor):
-            logging.warning("%d epochs with no activity -> sad" % self._epoch.inactive_for)
+            logging.warning("%d epochs with no activity -> sad", self._epoch.inactive_for)
             self._view.on_sad()
             plugins.on('sad', self)
         else:
@@ -77,7 +76,7 @@ def set_sad(self):
 
     def set_angry(self, factor):
         if not self._has_support_network_for(factor):
-            logging.warning("%d epochs with no activity -> angry" % self._epoch.inactive_for)
+            logging.warning("%d epochs with no activity -> angry", self._epoch.inactive_for)
             self._view.on_angry()
             plugins.on('angry', self)
         else:
@@ -85,7 +84,7 @@ def set_angry(self, factor):
             self.set_grateful()
 
     def set_excited(self):
-        logging.warning("%d epochs with activity -> excited" % self._epoch.active_for)
+        logging.warning("%d epochs with activity -> excited", self._epoch.active_for)
         self._view.on_excited()
         plugins.on('excited', self)
 
@@ -118,7 +117,7 @@ def next_epoch(self):
             if factor >= 2.0:
                 self.set_angry(factor)
             else:
-                logging.warning("agent missed %d interactions -> lonely" % did_miss)
+                logging.warning("agent missed %d interactions -> lonely", did_miss)
                 self.set_lonely()
         # after X times being bored, the status is set to sad or angry
         elif self._epoch.inactive_for >= self._config['personality']['sad_num_epochs']:
@@ -139,6 +138,6 @@ def next_epoch(self):
         plugins.on('epoch', self, self._epoch.epoch - 1, self._epoch.data())
 
         if self._epoch.blind_for >= self._config['main']['mon_max_blind_epochs']:
-            logging.critical("%d epochs without visible access points -> rebooting ..." % self._epoch.blind_for)
+            logging.critical("%d epochs without visible access points -> rebooting ...", self._epoch.blind_for)
             self._reboot()
             self._epoch.blind_for = 0
diff --git a/pwnagotchi/plugins/__init__.py b/pwnagotchi/plugins/__init__.py
index 9e7428b6a..72a39096d 100644
--- a/pwnagotchi/plugins/__init__.py
+++ b/pwnagotchi/plugins/__init__.py
@@ -1,6 +1,7 @@
 import os
 import glob
 import _thread
+import threading
 import importlib, importlib.util
 import logging
 from pwnagotchi.ui import view
@@ -8,17 +9,27 @@
 default_path = os.path.join(os.path.dirname(os.path.realpath(__file__)), "default")
 loaded = {}
 database = {}
+locks = {}
+
 
 class Plugin:
     @classmethod
     def __init_subclass__(cls, **kwargs):
         super().__init_subclass__(**kwargs)
-        global loaded
+        global loaded, locks
+
         plugin_name = cls.__module__.split('.')[0]
         plugin_instance = cls()
         logging.debug("loaded plugin %s as %s" % (plugin_name, plugin_instance))
         loaded[plugin_name] = plugin_instance
 
+        for attr_name in plugin_instance.__dir__():
+            if attr_name.startswith('on_'):
+                cb = getattr(plugin_instance, attr_name, None)
+                if cb is not None and callable(cb):
+                    locks["%s::%s" % (plugin_name, attr_name)] = threading.Lock()
+
+
 def toggle_plugin(name, enable=True):
     """
     Load or unload a plugin
@@ -47,15 +58,24 @@ def on(event_name, *args, **kwargs):
         one(plugin_name, event_name, *args, **kwargs)
 
 
+def locked_cb(lock_name, cb, *args, **kwargs):
+    global locks
+    with locks[lock_name]:
+        cb(*args, *kwargs)
+
+
 def one(plugin_name, event_name, *args, **kwargs):
     global loaded
+
     if plugin_name in loaded:
         plugin = loaded[plugin_name]
         cb_name = 'on_%s' % event_name
         callback = getattr(plugin, cb_name, None)
         if callback is not None and callable(callback):
             try:
-                _thread.start_new_thread(callback, (*args, *kwargs))
+                lock_name = "%s::%s" % (plugin_name, cb_name)
+                locked_cb_args = (lock_name, callback, *args, *kwargs)
+                _thread.start_new_thread(locked_cb, locked_cb_args)
             except Exception as e:
                 logging.error("error while running %s.%s : %s" % (plugin_name, cb_name, e))
                 logging.error(e, exc_info=True)
diff --git a/pwnagotchi/plugins/default/gps.py b/pwnagotchi/plugins/default/gps.py
index 7100c9a15..d3cce8dd6 100644
--- a/pwnagotchi/plugins/default/gps.py
+++ b/pwnagotchi/plugins/default/gps.py
@@ -113,6 +113,13 @@ def on_ui_setup(self, ui):
             ),
         )
 
+
+    def on_unload(self, ui):
+        with ui._lock:
+            ui.remove_element('latitude')
+            ui.remove_element('longitude')
+            ui.remove_element('altitude')
+
     def on_ui_update(self, ui):
         if self.coordinates and all([
             # avoid 0.000... measurements
diff --git a/pwnagotchi/plugins/default/memtemp.py b/pwnagotchi/plugins/default/memtemp.py
index 4d5dd6400..f64e287dc 100644
--- a/pwnagotchi/plugins/default/memtemp.py
+++ b/pwnagotchi/plugins/default/memtemp.py
@@ -53,6 +53,9 @@ def on_ui_setup(self, ui):
         elif ui.is_inky():
             h_pos = (140, 68)
             v_pos = (165, 54)
+        elif ui.is_waveshare27inch():
+            h_pos = (192, 138)
+            v_pos = (216, 122)
         else:
             h_pos = (155, 76)
             v_pos = (180, 61)
@@ -67,6 +70,10 @@ def on_ui_setup(self, ui):
                                                    position=h_pos,
                                                    label_font=fonts.Small, text_font=fonts.Small))
 
+    def on_unload(self, ui):
+        with ui._lock:
+            ui.remove_element('memtemp')
+
     def on_ui_update(self, ui):
         if self.options['scale'] == "fahrenheit":
             temp = (pwnagotchi.temperature() * 9 / 5) + 32
@@ -75,7 +82,7 @@ def on_ui_update(self, ui):
             temp = pwnagotchi.temperature() + 273.15
             symbol = "k"
         else:
-            # default to celsius 
+            # default to celsius
             temp = pwnagotchi.temperature()
             symbol = "c"
 
diff --git a/pwnagotchi/plugins/default/ups_lite.py b/pwnagotchi/plugins/default/ups_lite.py
index 871b0f770..ba864123d 100644
--- a/pwnagotchi/plugins/default/ups_lite.py
+++ b/pwnagotchi/plugins/default/ups_lite.py
@@ -58,5 +58,9 @@ def on_ui_setup(self, ui):
         ui.add_element('ups', LabeledValue(color=BLACK, label='UPS', value='0%/0V', position=(ui.width() / 2 + 15, 0),
                                            label_font=fonts.Bold, text_font=fonts.Medium))
 
+    def on_unload(self, ui):
+        with ui._lock:
+            ui.remove_element('ups')
+
     def on_ui_update(self, ui):
         ui.set('ups', "%2i%%" % self.ups.capacity())
diff --git a/pwnagotchi/plugins/default/webgpsmap.py b/pwnagotchi/plugins/default/webgpsmap.py
index 85479f9b6..3d7ae4df6 100644
--- a/pwnagotchi/plugins/default/webgpsmap.py
+++ b/pwnagotchi/plugins/default/webgpsmap.py
@@ -304,6 +304,9 @@ def timestamp_last(self):
         elif 'Updated' in self._json:
             # convert gps datetime to unix timestamp: "2019-10-05T23:12:40.422996+01:00"
             date_iso_formated = self._json['Updated']
+            #fix timezone "Z": "2019-11-28T04:44:46.79231Z" >> "2019-11-28T04:44:46.79231+00:00"
+            if date_iso_formated.endswith("Z"):
+              date_iso_formated = date_iso_formated[:-1] + "+00:00"
             # bad microseconds fix: fill/cut microseconds to 6 numbers
             part1, part2, part3 = re.split('\.|\+', date_iso_formated)
             part2 = part2.ljust(6, '0')[:6]
diff --git a/pwnagotchi/ui/hw/waveshare27inch.py b/pwnagotchi/ui/hw/waveshare27inch.py
index c554744b8..0cbc168e5 100644
--- a/pwnagotchi/ui/hw/waveshare27inch.py
+++ b/pwnagotchi/ui/hw/waveshare27inch.py
@@ -6,7 +6,7 @@
 
 class Waveshare27inch(DisplayImpl):
     def __init__(self, config):
-        super(Waveshare27inch, self).__init__(config, 'waveshare_2_7inch')
+        super(Waveshare27inch, self).__init__(config, 'waveshare27inch')
         self._display = None
 
     def layout(self):
diff --git a/pwnagotchi/utils.py b/pwnagotchi/utils.py
index 4d0ba90c5..0f912c841 100644
--- a/pwnagotchi/utils.py
+++ b/pwnagotchi/utils.py
@@ -10,6 +10,8 @@
 import json
 import shutil
 import gzip
+import contextlib
+import tempfile
 
 import pwnagotchi
 
@@ -345,6 +347,17 @@ def extract_from_pcap(path, fields):
 
     return results
 
+@contextlib.contextmanager
+def ensure_write(filename, mode='w'):
+    path = os.path.dirname(filename)
+    fd, tmp = tempfile.mkstemp(dir=path)
+
+    with os.fdopen(fd, mode) as f:
+        yield f
+        f.flush()
+        os.fsync(f.fileno())
+
+    os.replace(tmp, filename)
 
 class StatusFile(object):
     def __init__(self, path, data_format='raw'):
@@ -378,7 +391,7 @@ def newer_then_days(self, days):
     def update(self, data=None):
         self._updated = datetime.now()
         self.data = data
-        with open(self._path, 'w') as fp:
+        with ensure_write(self._path, 'w') as fp:
             if data is None:
                 fp.write(str(self._updated))
 
diff --git a/pwnagotchi/voice.py b/pwnagotchi/voice.py
index b1abd8a54..b69fefcfb 100644
--- a/pwnagotchi/voice.py
+++ b/pwnagotchi/voice.py
@@ -161,7 +161,10 @@ def on_rebooting(self):
 
     def on_last_session_data(self, last_session):
         status = self._('Kicked {num} stations\n').format(num=last_session.deauthed)
-        status += self._('Made {num} new friends\n').format(num=last_session.associated)
+        if last_session.associated > 999:
+            status += self._('Made >999 new friends\n')
+        else:
+            status += self._('Made {num} new friends\n').format(num=last_session.associated)
         status += self._('Got {num} handshakes\n').format(num=last_session.handshakes)
         if last_session.peers == 1:
             status += self._('Met 1 peer')
diff --git a/requirements.txt b/requirements.txt
index 20c2617b7..2b8eecfbc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,6 +3,7 @@ requests==2.21.0
 PyYAML==5.1
 scapy==2.4.3
 gym==0.14.0
+scipy==1.3.1
 stable-baselines==2.7.0
 tensorflow==1.13.1
 tensorflow-estimator==1.14.0
@@ -16,4 +17,4 @@ spidev==3.4
 gast==0.2.2
 flask==1.0.2
 flask-cors==3.0.7
-flask-wtf==0.14.2
\ No newline at end of file
+flask-wtf==0.14.2