my watch keeps skipping ahead an hou

I have had my series 3 cellular watch since 2018. Everything was great. But for the past couple of months it has sporadically skipped ahead an hour - for example, this afternoon I checked the time and it said 5:20. my wife said no way; I showed her - she showed me hers saying 4:20. ;) In reality it was 4:20. A few minutes later mine reverted to the correct time.

this has happened a half dozen times in last month or two that I know of.

We are in the North America Atlantic time zone, for what it’s worth.

Anybody else see anything like this?