defragster
Senior Member+
Feedback would have been nice to see given the posting of the code - it may help even now understand the nature of the failure when connected to PC. It might also come in useful for others later to see the results. I'm guessing 'LowVoltage' will appear - whatever it is the code would have shown that with a simple cut and paste. Though coming to bootloader might suggest 'Software' would show if that is being triggered like with a button press.
Indeed better to fix the problem - but having a decent idea of the nature of the problem - especially with it persisting to any degree.