Getting wet or moisture in some way getting to the amps will do it. Replace the fuses and see if it does it again. Also check the positive and negative cables. Sometimes they get moved around and make contact at the terminals. Some amps place the teminals really close together which can cause this problem.
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2004 Supra Launch SS
Acme 913 prop, WS 420, Kicker L5 sub, JL/Kicker amps, Kicker in boats, Polk mm in roswell bar, 3000# ballast.
"Never underestimate a man that Overestimates himself."