Sync problems for several months, takes hours sometimes, plain won't sync for a couple of days, can't connect to server, etc. etc.
After losing my Ironman race to sync problems then my XT910 decided to upload every activity for the last 4 months, twice.
I did get it to sync the last 2 events in less than 15 minutes, I love setting personal bests, YA.
Sticky says Sync Button not needed.
I say a whole new program is needed.
Never had an issue with Antenna Agent.
Garmin hardware good.
Garmin software bad.
Me ranting cause make me feel better, me no like Garmin lately.