first of all glad to have joined this great forum im a big chevy fan and wouldn't trade for any other ,,,, i have come across this slight problem with my suburban ltz 07 that by having done some reading seems to be a real common one on tahoes and suburbans ... our dealer down in the valley pretty much suck so loking for a solution, that i can fix away from the dealer , my radio flikers on and off by it self specially ive noticed on hot days

 

Hello,
Do you have another radio to test with? That will tell you if it's the radio or something else.

Don't know how electrically handy you are. But try taking the radio out, take the shell/cover off of it. Look for bad capacitors/condensers. Usually they are the main culprit to power fluxutations. If so, replace the those bad caps.