The radio that I put in recently is still working fine. So, you're correct, it was definitely something internal to the first two radios that I tried. The first two behaved identically, so that threw me off for quite a while and made me hesitant to try a third -- but that was the charm, as they say. It may not last long, but I'm enjoying it for now. I also replaced the two front door speakers with brand new ones. The foam had completely disintegrated on the originals, it's amazing that they worked as well as they did but the clue was they were "buzzy" when I turned up the bass.