Need some help here. We're too cheap to pay for satellite, so we use the AM/FM. Problem is this...when the radio is turned on everything sounds fine, after a few seconds the treble cuts out. It seems to affect AM and FM. Not sure about XM because that went away a long time ago. My wife thinks that CD is unaffected. Also unsure about the 3.5mm audio plug. We had the radio replaced under warranty a few years ago for the same problem. Is it a problem with reception thru the satellite antenna?