Lost settings

What was the issue? All settings (system settings and settings of all(?) Apps) were lost, but the apps were still installed.

Were all your apps still installed, or just the basic ones (eg not Gadgetbridge)? And was the clock face the Anton clock?

If the Storage gets corrupted then Bangle.js will replace everything with the default 'factory' settings just to keep itself working, so that may be what happened here. It's very hard to be able to know why Storage would have got corrupted in the first place though - and in fact that check only happens at reboot, so Storage would have had to have got corrupted and the watch would have have to have got rebooted somehow