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Pa-8001 output fading problem (experts read this please)

The amplifier plays normal for awhile, then cuts the output to my jl 10w7 by about 3/4. After exploring the problem for awhile i've noticed when i push on the "phase" adjustment, or adjacent controls the output shifts from normal to very quiet. There is also a small thumping to the sub immediately after pushing on the control knobs. I have also noticed that the sub appears to be pulled back towards the magnet while the output is affected. Any help at all would be appreciated. I have ruled out the cd-400, the 10 w7 and the power and rca connections, by using a good amplifier.

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