New H/U has been in car for about 3 days and has been working fine. But today it made a popping noise and turned it self off. This was followed by a strange electrical type smell. I have taken out the H/U and checked the fuse which is fine. The H/U is a sony cdx m8800, and the motorised front flip will still open and close which means that there is power going to it? I have also tried the reset buttons, but they have done nothing. Any more ideas before i send it away, i know sony is shite, but surley it should last longer than 3 days?