yeah the head unit is great. as far as the ground, it is grounded like it always has been. BUT, it is on a painted surface that i poorly scratched the paint off of. but it had never given me probs be4. heres another thing, it has been doin that for a couple weeks and it has actually stopped now (about 3 days ago). it was on mute and has been ever since. i dont wont it to start back and would rather hear no music than that unrhymic repetitive bumpin. ill take it off mute today and see if it does it and maybe get some sand paper and sand it better.
thanks for the replies, ideas, and suggestions. keep em comin if u think of any...i need em.