My CR-6 SE was not quite right. I also had some issues with the power supply. I was not able to resolve those issues without fixing this problem.

u/Q_not posted this thread on Reddit with an excellent explanation
  / a_possible_cause_for_the_usb_shorting_issue  

and there are some ongoing discussions in the CR-6 SE facebook group
  / cr6secr6max  

Hopefully this video shows everyone how to check their printers safely for this problem. Let me know if you have any questions