6000cd making noise when switched off
I have a 2009 cmax zetec 1.6 petrol and when I turn the radio off and close the door there is a continual and loud static/thumping noise form all the speakers it sounds every couple of seconds and I don't know what it is. I can only find one other mention of this on the web and it's for the same headunit but in a fiesta. It doesn't matter if the alram is armed or not but it does seem to stop if any door is open.
Anyone got any answers?