2015 Tahoe LTZ. Wondering if anyone has seen this before. Taken it to 2 dealers. Shown them videos of the issue occurring. Since there are no codes being thrown and they have never seen it occur while the vehicle is in the shop they say there is nothing they can do. They have upgraded the touch screen to the "latest" version and that hasn't done anything to help it. I have also had issues with the touchscreen where it goes completely non-responsive to touch but I can still change the stations using the steering wheel controls. I have another 9 months left on the 3 year/36k warranty. Hoping someone here has seen it and can tell me what part this more than likely is. i'm getting tired of the runaround from the dealers.