Index: dialin/protocols/CAN.py
===================================================================
diff -u -r46ebf93d3666db40f25ad1e9170426853aa845d4 -r12fc8d4dee213f861ee7645ce83c8b3a79896e10
--- dialin/protocols/CAN.py	(.../CAN.py)	(revision 46ebf93d3666db40f25ad1e9170426853aa845d4)
+++ dialin/protocols/CAN.py	(.../CAN.py)	(revision 12fc8d4dee213f861ee7645ce83c8b3a79896e10)
@@ -25,6 +25,7 @@
 from logging import Logger
 import struct
 from .. import common
+from ..utils import SingletonMeta
 
 
 class DenaliMessage:
@@ -432,7 +433,7 @@
             return None
 
 
-class DenaliCanMessenger:
+class DenaliCanMessenger(metaclass=SingletonMeta):
     START_BYTE = DenaliMessage.START_BYTE
     DIALIN_MSG_RESP_TO = 0.5  # number of seconds to wait for a response to a send command
 
@@ -444,7 +445,6 @@
         @return: DialityCanMessenger object
 
         """
-        super().__init__()
 
         self.logger = logger
         self.log_can = log_can
@@ -494,9 +494,12 @@
         else:
             self.run = True
             if self.message_queue_thread is not None and self.canbus_thread is not None:
-                self.canbus_thread.start()
-                self.message_queue_thread.start()
-                self.logger.info("Can listener has started.")
+                if not self.canbus_thread.is_alive():
+                    self.canbus_thread.start()
+                    self.logger.info("Canbus thread has started.")
+                if not self.message_queue_thread.is_alive():
+                    self.message_queue_thread.start()
+                    self.logger.info("Message queue thread has started.")
             else:
                 self.logger.error("Cannot start listener...")
 
Index: dialin/utils/__init__.py
===================================================================
diff -u -rb20262631dc86edf5c3550762bc888089fa2626d -r12fc8d4dee213f861ee7645ce83c8b3a79896e10
--- dialin/utils/__init__.py	(.../__init__.py)	(revision b20262631dc86edf5c3550762bc888089fa2626d)
+++ dialin/utils/__init__.py	(.../__init__.py)	(revision 12fc8d4dee213f861ee7645ce83c8b3a79896e10)
@@ -3,6 +3,7 @@
 from .conversions import *
 from .excel_ops import *
 from .nv_ops_utils import *
+from .singleton import *
 from .data_logger import DataLogger
 YES = 1
 NO = 0
\ No newline at end of file
Index: dialin/utils/conversions.py
===================================================================
diff -u -rb17d2a1969b535d66bf534556ac42fd2bb28fd1d -r12fc8d4dee213f861ee7645ce83c8b3a79896e10
--- dialin/utils/conversions.py	(.../conversions.py)	(revision b17d2a1969b535d66bf534556ac42fd2bb28fd1d)
+++ dialin/utils/conversions.py	(.../conversions.py)	(revision 12fc8d4dee213f861ee7645ce83c8b3a79896e10)
@@ -55,6 +55,7 @@
     """
     return struct.pack("<I", val)
 
+
 def float_to_bytearray(val):
     """
     Converts a float value into a byte array (little endian)
Index: dialin/utils/data_logger.py
===================================================================
diff -u -r6780ca960d531deda7056cf910baa59826468223 -r12fc8d4dee213f861ee7645ce83c8b3a79896e10
--- dialin/utils/data_logger.py	(.../data_logger.py)	(revision 6780ca960d531deda7056cf910baa59826468223)
+++ dialin/utils/data_logger.py	(.../data_logger.py)	(revision 12fc8d4dee213f861ee7645ce83c8b3a79896e10)
@@ -41,6 +41,7 @@
         """
         super().__init__()
         self.queue = deque()  # Thread safe
+        self.disable_logging = False
         self.thread = threading.Thread(target=self.logging_scheduler, daemon=True)
         self.base_folder = folder
         self.csv_writers = {}
@@ -64,7 +65,8 @@
         :return: None
         """
         # ("module", "timestamp", "header", "value")
-        self.queue.append(data)
+        if not self.disable_logging:
+            self.queue.append(data)
 
     def do_data_logging(self) -> None:
         """
@@ -100,10 +102,13 @@
         :param output_path: (str) the destination output path
         :return: None
         """
+        self.logger.debug("Starting data export to {0}".format(output_path))
+        self.disable_logging = True
         log_path = os.path.join(self.base_folder, "*Log")
         folders = glob.glob(log_path)
         if len(folders) == 0:
             self.logger.debug("No folder with data to export")
+            self.disable_logging = False
             return
         writer = pd.ExcelWriter(output_path)
         for folder in folders:
@@ -115,19 +120,26 @@
                 df_data = pd.read_csv(csv_file)
                 df_data = df_data.set_index("timestamp")
                 df = df.join(df_data, how="outer")
-            df.to_excel(writer, sheet_name=module_name)
-            self.logger.debug("Added {0} to {1}".format(module_name, output_path))
+            try:
+                df.to_excel(writer, sheet_name=module_name)
+                self.logger.debug("Added {0} to {1}".format(module_name, output_path))
+            except ValueError as e:
+                self.logger.error("Error during write to excel: {0}".format(e))
+                
             writer.save()
         self.logger.debug("Finished data export to {0}".format(output_path))
+        self.disable_logging = False
 
     def clear_logs(self):
         """
         Called when the user clears the logs
         :return: None
         """
+        self.disable_logging = True
         log_path = os.path.join(self.base_folder, "*Log")
         folders = glob.glob(log_path)
         for folder in folders:
             self.logger.debug("Removing {0}".format(folder))
             shutil.rmtree(folder)
+        self.disable_logging = False
 
Index: dialin/utils/singleton.py
===================================================================
diff -u -r6780ca960d531deda7056cf910baa59826468223 -r12fc8d4dee213f861ee7645ce83c8b3a79896e10
--- dialin/utils/singleton.py	(.../singleton.py)	(revision 6780ca960d531deda7056cf910baa59826468223)
+++ dialin/utils/singleton.py	(.../singleton.py)	(revision 12fc8d4dee213f861ee7645ce83c8b3a79896e10)
@@ -24,6 +24,7 @@
     _instances = {}
 
     _lock: Lock = Lock()
+    _creation_attempts = 0
     """
     Synchronizes threads during first access to the Singleton.
     """
@@ -33,6 +34,9 @@
         Possible changes to the value of the `__init__` argument do not affect
         the returned instance.
         """
+        cls._creation_attempts += 1
+        # Keep for debugging
+        # print("CAN interface constructor call counter: {0}".format(cls._creation_attempts))
         # First thread acquires the lock
         with cls._lock:
             if cls not in cls._instances: