Hi guys, I've upgraded my poverty spec radio to a dynavin d99 head unit in my 2007 cls. I carried out the install myself which was straight forward but I have a slight problem with it. Every now and again the sound seems to cut out for a second or two. This happens on the radio,ipod and disc. The unit itself doesn't seem to switch off and it is only the sound that does not work. Any ideas would be appreciated.