+ AA6YQ comments below
Hygain Rotor Controller with ERC Version 4 SMD USB interface, All USB ports are not set for energy savings....so they never turn off....
+ Then I recommend two next steps:
1. check the Windows Event Logs for indications of hardware or software failures around the time when the lockups occurred.
2. reboot Windows into "Safe Mode with Networking"; do the lockups still occur?