[Bangle.js 2] Seemingly random freezes / unresponsive?

Sorry for the delay replying here... That's really interesting! It might explain why it's been very hard to pin down.

Is it possible that an unreliable connection causes a deadlock on the watch when the connection is lost during data transfer between Gadgetbridge and the watch?

It shouldn't happen but I guess there is some small chance. I don't think there is anything in Espruino itself that would suffer however I guess there is a chance it's something at a lower level in the bluetooth stack that is causing problems.

If I had a way to reliably reproduce this here then I could get one of the watches set up on a hardware debugger and might have more of an idea what's going wrong.