Have the same problem. After changing the USB port in the service phone recognized by computer only few times, after that no reaction from pc. (when i connect the phone there is no "device connected" sound). When phone actually recognized I tried to recover it with Companion but when device rebooted it didnt started the flashing, just charging.
Also phone started to charge very slowly, with only 500ma current.
As I wrote before, port repair doesn't helps. I think that's a controller/software problem.
