The sync problems are making me crazy!!!
And the treatment. Sometimes it doesn't work or only works temporarily or it might last for months but NEVER forever. So anyway I think this is the treatment but I might be slightly wrong or are there additional things I could do?
Turn the phone off and on.
If that doesn't work:
A) Clear the cache in Connect IQ and Garmin Connect. Maybe also the data??
B) Unpair watch bluetooth connection and make sure it's not in available devices.
C) Cycle the phone off and on.
D) Reconnect the watch.