I have a 2018 Silverado 2500hd with an older Western ultramount. When I hit the controls it quite often kills my blower motor. It also will kill my dash lights and gauges and sometimes the Stabilitrac message pops up. I also often hear a back feed through my speakers. It started only when I was driving down the road and hit the control but now it does it when I’m plowing also. It’s getting more frequent and the blower is taking longer to come back on. I tried another controller and there was no change. Any ideas of what it could be? Thanks.