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Forerunner 645 only syncing when plugged in

My watch recently stopped syncing with the connect app. Only when I plug the watch in will it sync the previous 24 hours info. I have restarted, deleted, forgotten, reinstalled and logged in and out of everything I can think of. 
The ‘sync’ loop will go about 1/4 around, then just complete the loop.

Any help or solutions would be appreciated. 

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  • I figured it out. I really appreciate the quick responses. 
    I got the current activities off my watch and into the app. Then I deleted all the activities on the watch. Then I factory reset the watch. Then I removed the watch from the app and deleted it. Then started over fresh and, viola. The watch is syncing like it should. 
    I had never considered deleting activities from the watch after syncing. I’m not sure if it was clogged up with information but I think I’ll try removing the activities from the watch monthly and try to prevent this from happening again.

    Any thoughts on that as a plan are welcome.

    Thank you again. 

  • Any thoughts on that as a plan are welcome.

    Keeping the FIT files located in the \GARMIN\ACTIVITY folder is one of the recommended maintenance tasks. Although I like the "scorched earth" approach. Grinning