Have checked the three power wires 2 are red/yellow and one is green/white
R/y are at 12v plus g/w is at 11.8v
Cleaned all the contacts ( but they were not corroded or dirty) and sprayed with contact cleaner
All to no avail the problem is still there, runs for about 40 mins initially then cuts off. If you leave it for 10 mins it will work again for about 10 mins then go off.
Anyone got any more ideas before I look for another stock amp