I have my FR645M from ~1y in this time I have strava premium not more than 2 months, but few days ago just bought a year subscription, also change my cellphone.
So what happen, my watch have some difficults to sync, sync time become longer, first guess that reason is the new phone. Then i check HR records and there are a long periods with the same value for example 4h with HR 66. Sometimes notifications stops and when check connect app it seems that watch is not connected, fix is restart of the watch.
Today realize that watch was not tracked my HR from 2:45, also it disconnect the connect app.
Also the sync time is become longer - may be 60sec. Right after the sync FR645 watch face freeze for maybe 20-40 sec and buttons not work (except light)
What I try:
1. reset without delete activities and music - not help
2. reset with delete all - not help,
3. disable strava segments - voala the sync time has near 1-2sec again.
Not sure it this affect only latest soft version 7.0 or it is from before, but my problem is that I want to use strava live segments on my Edge 530, also I want to use FR645 with bluetooth connection synced with my phone. So if there are a way to stop strava segments for only one device that should be a solution.