Got a little issue thats getting worse

[bikerbomber]

Hey guys,
I did a self-install of a sony CD/Mp3 Player back in December of 2008. I had done it before so never had any issues. Well I got a little froggy and threw in a speaker box I had cobbled together and a little 75w amp to power said box...

I was having issues getting the cigarette lighter to work before so I ran the wiring off that to the amp. (I knew I would get a ground loop, but the noise canceller got rid of that)

I have had zero problems with the system until a week ago.

The rear speakers began to occasionally have ground loop noise. It would appear for no reason only to disappear for no reason. I thought maybe the ground loop isolator was the problem. So I got a new one. No difference and as time has passed I get ground loop noise all the time, except at start up, but after about a minute, it starts again.

Another issue is my CD deck has started to turn itself off every now and again.

Can anyone suggest what is going on? I thought it was just the amp wiring (Being run off a poor source) But the deck is wigging out now too.

Thanks guys