WIRING ABOVE SPARE TIRE RUBBING AGAINST METAL FLOOR PAN. CUTS INTO DATA LINE CAUSING THESE ISSUES. I HAVE A 15 YUKON,SAME AS ALL OF YOU,STEERING GOING OUT,RADIO GOES OUT,LAMPS FLICKER OR GO OUT FOR JUST 1-3 SECONDS. FIXED THE WIRING,ALL GOOD. HOPE THIS HELPS