Something to try out
Go to Power settings, left click the mouse, More power settings, select change power settings, change advanced power settings, and look for USB Settings; click the little box + and open USB selective suspend settings and if enabled is set, for both on battery & on power; toggle the setting to disabled and save your selection in the usual way. I've done this on a Win 8.1 Dell (the Ver 7 Pro PC is locked away so the exact options may differ a bit). It stopped the nuisance USB dropouts/fail to find issues for me.
CAT III