I've just installed a new AVR300 into my system, but the power has cut out twice for no particular reason. There is no specific time interval between switching the unit on and it cutting out, and it's happened whilst playing music and whilst watching a movie - both at fairly low volume. It's been on for several hours without a problem, but then most recently cut out after about 60mins. The screen shows 'standby' and that's it. I can turn it straight back on again and it'll stay on with no problem - so I doubt it can be any kind of overheating. Speaker impedance is set to 4Ohms, voltage to 230. I've checked all the connections at the back for any touching wires and can't find anything wrong. Anyone got any suggestions before I contact my dealer for a replacement?