I have a laptop dedicated for tuning only. Never connects to the net, etc. Sometimes when the car sits for a few days with the main battery disconnected I'll get the "No RR USB device found"....Turn it off/on a few times and all is good. I've even gotten that after downloading a couple of tunes....also from time to time get the "This file is not compatible"...same thing...off/on and the file will download.......even had it kill the car once during an idle....downloaded a tune and the car shut down...all and all a great product....just curious if mines glitchy.