NO, Yamaha points in their instruction to configure the PC to give priority on background processes, which I configured, so you are right its likely a sensitive for their USB-MIDI driver.
In my situation I clearly proved its noise/spikes on the mains, causing unwanted signal to the PC USB that causes to lock-up the PC's USB chip. Reboot required.
Finally the TYROS USB went defect completely, requiring repair in the service shop. I'm waiting for Yamaha's answer on the subject, as others in their country also have contact with Yamaha for the same problem. As soon as I know I will put a message in this forum. Wait and See.