AES console resets during initial power on

My AES resets itself couple of times when I insert a SS2 cart. Everything is original, power unit is a Triad WSX090-2500-R, AES is 3-6. Ive cleaned pins on both console and game. What could problem be? It seems to reset itself in first 1-2 mins during play but as it "warms up" problem dissapears.