I've never seen this happen before in years of owning Garmin watches.
This morning my 5am alarm was turned off by itself and the 4:30am alarm which I use after DST and was off, turned on, all by itself.
So vivosmart 4 woke me up at 4:30am instead of 5am
How is that even possible? I never touch the alarm settings, like once a year?
Maybe it's Garmin Connect app? I see some visual changes but why would it tamper with alarm settings and push them to the watch?