diff --git a/modem.py b/modem.py
index 657b20a..6a3545c 100644
--- a/modem.py
+++ b/modem.py
@@ -19,6 +19,7 @@ def run(self):
             try:
                 self.modem.connect()
             except (TimeoutException,IOError) as e:
+                self.modem.close()
                 exc_type, exc_value, exc_traceback = sys.exc_info()
                 logging.debug(traceback.format_tb(exc_traceback))
                 time.sleep(10)