I own a 01 grand prix 3.1L, I recently dealt with the whole water leaking in thru the RF side, I fix that problem but started to have a audio problem. about 6 months after I fix the water problem my rear speakers would come on once in a while. If I let my car sit in the sun, once the inside is hot my rear speakers work fine, but once it cools down they shut off. Any Ideas of what this might be? I already changed the Stereo and still have the same issue.