Sound in front cuts

Hey the audio in my car cuts off and on, most of the time it cuts off then will come back on but only on the front two doors, the back stays on .....i've checked all the wires and everything nice and tight. Does any one know what could be the problem....could it be the jacks....

are your amps gettin hot?

see if your wires are grounding out. also one of your speakers may be going bad and the coil could be rubbing on the motor structure causing it to ground.