Hi all. Have c max grande titanium with the Sony head unit . So driving, radio on, all fine. Pull up, close car , come back 30 mins later , turn radio on and o m g, speakers sound awful ? Fade to rear speakers, fine, front speakers can hardly hear anything but distortion and cracking , tried c d , the same ?? Any ideas? One minute fine, return to car , front speakers sound blown ?? Even checked I had got into right car !!!