I have a 2015 Tahoe. Every 13 minutes, the radio shuts off - no audio and the screen goes black. After a few seconds, the audio comes back and a few seconds after that the screen is back on. The dealer tried reprogramming the radio and then replaced the radio, but it didn't fix the problem. Is this being caused by a bad ignition switch? Is the door switch the problem? Could it be a bad fuse? Thanks for any input.