Flat furniture ice

Subwoofer/Amp randomly cuts off? - my subwoofer power light is always on

I have a class-D amp MTX-mode, two subs Alpine R.'ve always worked well, but now they are uncertain, and are made with music. I installed my old car in my new, where he worked for a while, but now they do. The red light is provided on the amplifier so as not to lose their power completely when this happens. All the suggestions we are very grateful!