Try this:
Start > Control Panel > Power Options (if not visible change view to Large Icons at top right) > Change Plan Settings (for whatever plan you want) > Change Advanced Power Settings > Change settings that are currently unavailable > Set USB selective suspend setting to Disabled under USB settings and then click OK to save the changes.
You may have to reboot.
Or this:
Make sure "wake by USB".... or something like that, is set to disable in BIOS.
I can't download your MB manual right now to see where it is.