For the last couple of weeks, my midi controller keeps crashing ableton?!?! Had the controller since last christmas, and have had no problems at all. But recently, if I switch on my controller, and open uo Ableton, it works for about 3-4 minutes, then it just crashes everything? Any ideas what is causing this? I've tried uninstalling / reinstalling the drivers, and the drivers are all up to date too?!