1 out of 2 motors stops spinning after starting

Hello. I’m new to this. And after the assembly and configuration can not determine the cause of the problem. After the start, one of the motors stops spinning. I changed the motors in places on VESC. And the problem is in the same motor. I disassembled it. But any visible defects i didn see. I do not know what to look for and how to treat it - please help with advice. Thanks. Photo and video of problem