Input changes when I hit a bump
 

I'm new to the forum and to the HHR. I have only had it a week and have found that with the radio on XM, when I back out of the garage and over the curb, the radio changes to AUX Input. Seems to do it after first getting into the car as I went to the airport today and ran over several speed bumps and it didn't do it. Didn't do it when I came home either. I did hit the side of the console with my fist and that made it change once but not a second time. I haven't tried using the AUX input yet but it shouldn't be changing by itself. Any one else had this happen and found out what does it?

Thanks
Bob

Welcome to the site, Bob. pop off the waterfall cover and tighten up the retaining screws, for the head unit.

x2 ^^

i get this also randomly when i turn on the fog lights - not over bumps