Hey. Maybe I can help. I had the same problem, after I had driven a total recovery of my PC. I installed the driver and Rep Snapper again, but I could not get Rep Snapper to connect more than a few seconds. I know that my 3D printer had worked before recovery. I might have missed something in the setup of Rep Snapper? yes I hate! Open your firmware in Arduino, here you should look for: #by Rosqvist - RAMPS Electronics