Series 3 - Rebooting after WatchOS 7

My Series 3 keeps restarting after the upgrade to WatchOS 7. Before that, it worked perfect.

I did a complete reset but the problem is still there. It happens 2-3 times per day, randomly, when wearing it (no action, no touch, nothing).

Here is a safe link to a form with hundreds of other people having the same problem:

https://forums.macrumors.com/threads/series-3-rebooting-after-watchos-7.2255209/