Samsung5000

Hey guys, I want your help regarding a problem I've been having in my recent cars.

I have an iPaul DM2000 amp, two rainbow 10'' subwoofers, and a pioneer headunit. Sometimes my bass randomly turns off, and after one day or so, it turns back on.
But the weird thing is, that if I turn up my volume to around 30, which is high, the bass comes back, but sounds rather distorted.

Anyone that have ever experienced same problem, or similiar? I'd love some help.

Thanks in advance.