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"to turn on a drilling tool"

Um OK, first I'd heard of that. Suggests things, doesn't it? Drill turns on, instant glitch. Suggests hardware. Drill in contact with rock, rock chips fly, rock chips hit things, things stop working.

They say they are only getting "meaningless radio noise" or the safe mode beep. Suggests a problem with the transmitter. What is the layout of this? Anybody got a diagram?

Another thread says, more specifically, that they were trying to calibrate the motors in the arm when the failure occurred. Which doesn't suggest bits of flying rock, but still does suggest a possible hardware problem. Perhaps all the heating and cooling cycles the thing has been through cracked something that failed when one motor was used at above a certain speed, or something similar. It sounds like the software has been rebooting over and over, but transmission is clear for limited periods, suggesting no serious damage to the actual transmitter or antennae.