How to fix my psw110 line in problem no sound

i have a polkaudio psw 110
it ons but no sound. only when i jiggle the line in wires . sound comes in and out. now i have to jiggle it harder to play sound. but wont play consistent please help me. i really wanna fix it.
it ons but no sound. only when i jiggle the line in wires . sound comes in and out. now i have to jiggle it harder to play sound. but wont play consistent please help me. i really wanna fix it.
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Answers
Office Rig- Marantz 2252B, Denon 2910, Kenwood KD2070 TT, Polk RTA 12B's/ RTA8t