XIAO nRF52840 & Wio-SX1262 Kit stops working after a few hours (Meshcore)

Hi!

I built 2 Meshcore repeaters out of the Xiao set and have some strange behaviour. I added a 3.7V Li-Ion battery and everything is working fine for about one day. Out of a sudden the devices stop working - a steady red LED is on and all I can do is unplug the battery and plug it in again to restart the device. After this this it works for another day.

Anyone else having this problem? Or, does anybody know, what it means when the red LED is on instead of blinking?

Thanks!

my7 guess would be some sort of timer overflow… the 16 bit timer problem