Subwoofer cuts out. I have a Panasonic receiver that is attached to a set of Sony surround

Question

I have a Panasonic receiver that is attached to a set of Sony surround speakers. The subwoofer has cut out for years, and the only way I can seem to fix it is by unplugging the audio input from the subwoofer, tapping it on the input jack, and re-inserting it. It almost needs to get rid of static or something. I`ve recently purchased a new subwoofer (Precision Acoustics) - same problem. Cuts out after a day or so.

Suggestions?