Forget to start or restart a route tracker/data recorder - all the time - well, at least frequently. Usually when I stop to run into a store, I’ll stop it because walking around still tracks the data, and it would screw up my times - then forget to restart the app when I ride off.

Then, there is the failure to finalize a ride, so later while driving I hear it go off - with some pretty unrealistic numbers on the current split.