Some suggestions to help minimize the occurrence of corrupt fit files:
After verifying that everything has synced, remove the files in the \GARMIN\ACTIVITY folder on the device’s file system using these directions: Removing Recorded Activities on a Garmin Fitness Device If you're using a Mac computer, empty the trash folder before you unplug your device from the computer
Avoid excessive button presses such as pausing during your activity
Regularly check for firmware updates usingGarmin Express
If issues with corrupt files persist, contactGarmin Support
