All the good days. There is a two-channel amplifier Hifonics Centurion X, it is connected to the subwoofer to bridge two channels. The problem is that the amplifier is switched off periodically, moreover, he does not go to protecting, and as if the control voltage is lost, it does not glow either one LED, but the voltage at the terminals of the amplifier is present. Then he turns on when he wants. When I check the house amplifier works fine, but if the fee is slightly curved, the power is lost.It seems that the bad soldering, but visual inspection did not find places with poor soldering. Can anyone have a schematic diagram of this amplifier? If you want I can take pictures of the board.