Sounds like water/moisture has got in the amp. Well known problem, the crackling and booming can be ear splitting and puts the shits up you when it happens. There’s a vent directly above the amp left hand rear arch which is poor design imo, have a check if it’s dry in there. Trip to the dealership as it won’t get any better, had my amp swapped last year and now my ASD module has gone pop.
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