Beauterham

Hi everyone. I have a set of ProMedia 2.1 that I purchased in 2001 and so far it has been nothing but excellent. However the last few months the subwoofer behaves oddly. When I set the subwoofer volume on the control pod to low (7 - 10 o clock), then the subwoofer cuts out sometimes. I can remedy this by turning the subwoofer volume control to max and then back to the desired volume. On a good day I only need to do this trick once, and on a bad day I need to do this trick multiple times. Also, when I set the subwoofer volume louder ( 11 o clock till maximum), then the sound of the subwoofer never cuts out. Do you guys know how I can fix this issue. Is it a subwoofer problem or could it also be a control pod issue?