I just recently purchased a 98 GST with the Factory Infinity Premium sound system. The previous owner had the dealership install a Pioneer 12 disc changer. The changer seems to only work through the FM station 89.1 and the factory CD player in the deck does not seem to respond after switching to the CD Changer. Also, even when not using the CD changer, after a few minutes with the car running, the CD controls seems to just be locked out! The CD continues to play, but I none of the control respond anymore. Then, if I shut the car off for about a minute, the CD players works properly again....for a few minutes then the controls stop responding again! Anyone have this type of problem? Do I just need to swap out the POS factory infinity stereo?