Suddenly my Note II will not connect to my PC. The message on the PC side is USB Device not Recognized. The message is consistent whether the phone is in Installer Mode, MTP mode, or PTP mode. I have tried it on three different PCs (one Windows 8.1, two Win 7) with four different cables and the result is the same. I have powered down and up and the result is the same. Don't know what to try next.