Hmm, not good. The tracks are very fine (as they are only audio grounds, after all!) and I bet you probably wouldn't have noticed them go. Are you sure you never had a bad ground connection, eg during installation when the sled wasn't fully fitted?

Also, check the ground wire to the sled is secure.

I should be able to get it fixed very quickly. If you don't want to return it yet, you can always just short these RCA shields to the empeg ground and it will behave as if it were fixed.

Hugo