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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Old_account
Quick update.
As already expressed earlier in this thread, everything points to it being my phone that is causing this issue. As a test, I let the phone stay awake, with the screen on, for 2 hours, all the while having the watch connected and going about as usual (made sure to not get too far from the phone to avoid disconnecting caused by distance). After that I turned the phone screen off and let it stay like that for an additional 30 minutes.
During the first 2 hours (screen on) there where 2 instances of the watch and phone losing connection (reason 8 both times), but it was quickly reestablished (within a few seconds). In the last 30 minutes (screen off) there where 25 connection state changes, of which only 9 where successful connection attempts and the rest failed (8 reason 8 and 1 reason 34 from an active connection, and 7 reason 133 when trying to reconnect).