Hi, I'm new to here, just bought a nice little a 180 diesel. Car's great, but the radio will only play for about half an hour whilst driving. No sound at all from the radio, cd player or hands free. Will not reset at all. Leave it overnight and it comes back on. If I play the radio with the engine off, it's fine. But if I run the engine it will go off after about half an hour. Could it be something to do with the amplifier. Anyone had any problems like this. Thanks in advance.