the above amp it starts normaly but after few seconds or one hour goes in protect mode for 1 to 3 seconds.that happens when cold for few times and amp run ok for 1 or 2 hours then can go to protect again for once or few times for 1 to 3 sec.makes me mad i have resolder everything under board.i have unsolder one by one neasured and solder new one every time to check if problem fixed all smal to92s trans.i have replace all 1448 and bzx diodes.change few suspect resistors ..symetry is perfect dc on output is zero to 1mv.bias is perfect and stable all the voltages are present.on thermal camera i dont see any overheating components just normaly temps on few bias and some relay resistors .when amp plays on subwoofers the sound is perfect and powerfull.anyone have experienced this problem?or any advice what i miss to check?thanks for any help.