my stereo stopped working

Out of the blue yesterday my stereo started cutting out. It does it at any volume. At first it would cut out for a few seconds and come back. Then it sometimes cut out for 2 mins and come back. Went over a speed bump today and it hasn't come on since. Deck works. Doesn't matter if its CD or Tuner. No sound but deck equalizer display shows music flowing. Its a Kenwood deck.I have 2 Alpine V12 amps. The subwoofer amp usually shows 14.3 volts on the display but the display is dead and shows nothing at all.I see 12 volts on the stereo side of the main inline fuse under the hood.At the amps I only see about 4 volts going into each of them. The remote wire shows about 3 volts.When I turn the deck off I see 7 volts at the amps and 5 volts at the remote wire.1993 Camaro Z28 383 LT1.

The ground wires for your amps are not making a good connection to your vehicle.