Alpine head w/removable face, installed before I bought the car, not sure how old. Infiniti sub Circuit City installed last summer. Lately sound crackles like static and cuts out over sharp bumps, during acceleration, cornering over bumps. No problem at idle or steady state motion over relatively smooth pavement. Car is lowered and stiffly-sprung. Happens both CD & radio, however CDs dont seem to be skipping. Illumination on faceplate doesnt flicker at all. Have pulled the head from the dash and checked the harness, seems good, stereo operates fine while I twist, tug and shake. Is this a problem with some other wires? Is it a problem with the pin connector between the faceplate and head?