Amp protection mode with bass

[airofu]

Installed an older monoblock amp, powers up ok, but noticed it going into protection mode each time the bass hits (even with sub disconnected, worse when it is and seems to draw heaps of power as the car lights flick also, but no output to the sub), I'm guessing something is overloading on the amp even with gains down, can it be repaired easily? Swapped over to a working monoblock on the same cabling and works fine.

[slowfkncar]

Probably a bad amp, if its dimming lights with no load then stay away lol