bad wiring

Okay so I have a Skar 800w Amp paired with a skar 1200w 10 inch sub. I also have a lc2i running to the amp. I haven't had many problems with it until recently, I was driving and all of a sudden my sub just cut out, so I pulled over and my amp was in protection mode, I fixed the issue for that...

I have a 96 Jetta Trek with a stock system as far as I know. I had a low grade JVC head unit in that I wired myself and worked fine for about 2 years. While driving the 2 front and 2 rear speakers cut out but my subs and amp in the trunk would still work. After cutting power (the main plug to...