Two different watches have done this. One 255s and one 255s Music.
It happened twice on the first and once on the second.
When I started a Health Snapshot, the watch kept vibrating. Happened on both watches.
When a time alarm went off, it kept vibrating after I turned it off. First watch.
I had first watch about a month and second less than a week. Software stable 16.xx.
Is this a known bug?
After 18.22 was installed yesterday, I synced a few hours later, then restarted the watch. At bed time I tried to do a Health Snapshot as per usual. It vibrated four or five times before I got one start of Health Snapshot that didn't vibrate. Unfortunately one of the times I stopped the HS, it triggered morning report, minutes after I'd put my head on my pillow, so HRV reading was cut off. I manually started sleep mode, but it wasn't enough to get HRV to record for the whole night.
I was able to live with it before, but this is no good!
Exact same thing happened to me, on 18.22. Initiated a health snapshot at night, with watch already in Sleep Mode (triggered automatically). Got the continuous buzzing, stopped the snapshot, did another snapshot, and a morning report was launched as if I had awakened in the morning lol.
This is what a normal night looks like:
