Every time I charge my Forerunner 55 via my computer it stops recording Heart Rate, Stress and Body Battery (maybe more, but those are the ones I have noticed).
The other things I look at regularly don't seem to be affected by this.
I used to have a Forerunner 45 untill a few weeks ago, when I switched to the 55.
The 45 has never had any of these issues.
With the 55 I have had the problems right from the start.
The first time I didn't know what caused the problem and tried many things to solve the issue (pairing and unpairing the 55, removing it from my gamin accounts completely (connect etc.) and then adding it again. But nothing worked.
Untill I finally found that turning the watch of and then on again would (temporarily) resolve the issue.
However, this is now the second time I am charging my watch since I have it and I am now pretty sure that the charging of my watch causes the body battery to stop working/recording.
Hopefully you guys will be able to fix this properly and in a timely fashion, because resetting the watch every week or so to make sure I only lose a minimum amount of data is just plain ridiculous. Especially since you guys are aware of this problem for over 3 years now, by looking at your forums.