since it cuts out when ya put ya foot down it must be moving. does it just go silent or does it crackle and make all sorts of noises. There may be a wire inside the sub box that is loose. turn the tunes on and shake ya sub then shake the amp if that doesn't show where the problem is you've got me stumped too. unless ya battery is loose. try wiggle the battery leads. an intermittent fault like that is 90% a loose connection somewhere.
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