Hello dear members, I have the following problem. I have an Alfa Romeo 147 built in 2009. I had previously installed a Pionieer Radio (No Standard Radio). I recently bought the Clarion VZ402E. I put the old one out, plugged the new one in and turned it on. Everything was ok. When I then installed the radio into the holder and switched it on, I had no sound. I took it out again and controlled all the connections. However, I could not use the radio. After hours of troubleshooting I gave up afterwards. The next day the ambition packed me and I tried to find the error again. At once the radio worked again perfectly although I did not change anything. I installed the radio into the holder and everything worked. About 4 hours later the sound just went off again during the ride. Radio however remained quite normal. Now my question, it may be that the radio has a protective function, where the sound is switched to mute in order to protect the internal amplifier? The funny thing is that it won’t even transmit a sound to the power stage even though the LS and subwoofers run on separate systems. (LS via standard Iso plug) Can it be that the resistance of an LS is not in Ordnun, that is to say, Wackekontakt has and therefore the radio switches to Mute? Please help me to despair….