music stops? help?

[culpepper013]

i have a problem...i have 6 1/2 " polk audio door speakers powered by a 4 channel kicker amp. when i put the volume past a certain level (about 25 or 30) the speakers just stop. the back 2 speakers are connected to the head unit and the front 2 speakers connected to the amp. any ideas why this happens? it stops the music but the bass continues hitting and the music turns off and on randomly....maybe a loose wire? any ideas?

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