Help.... I've been having major problems with my AV setup just recently.... My sub stopped working intermittently, then gave up the ghost altgother. Thats been looked at and sorted separately... I rewired my Kef eggs to a mate's amp (or rather he did) to check stuff out, but since wiring it back to my Marantz 5200 again, if left playing even through the TV for a short space of time (approx 5 mins) the Amp switches itself off... I'm presuming there is some sort of crossed wire somewhere, but having checked all the connections, nothing appears to be touching... Is there anything else I can check?