I have a 2007 Santa Fe, great vehicle but I've noticed that very frequently the 'stereo' sound goes in and out. There's no static but it's comparable to someone holding their hand over the speaker causing the sound to be muffled (if that makes any sense). I read the owner's manual and it indicated that when a radio signal from the source station is not very strong this is likely to occur....the problem is it happens on all the radio stations in the city where I live. In any other vehicle the reception is perfect and this doesn't happen?? Anyone have the same problem or suggestions?