HTTC-AB02S stops working after some hours using GPS and LORA-TTN

Hi,
I am trying the HTTC-AB02S board with the example sketch LoRaWan_OnBoardGPS_Air530.ino.
After some hours (around 6-20) the board stops sending data to the TTN, it also does not show anything more in the serial printout…
I clouned the newest master code using git and I also checked out a special serial fix ( 85c0c75 which sould resolve some memory leaks but without success…
I have 2 of these boards to ensure that I do not have any hardware trouble…

Any Ideas from Heltec maybe?

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