Hello,
A few days ago I received an update on my vivoactive 3.
Since then my watch shut down during my after work cycling activities.
It happend 3 times already this week.
I didn't even get the white screen with "battery is getting low" like it used to do.
You look at it and it's fine, look again 2 minutes later and the screen is all black.
I'm aware that battery might run out faster when the weather is cloudy but this is extreme.
Barely an half hour instead of the usual 4 hours.
So I'm suspecting the update is involved.