Whats wrong with my stereo?

I installed as a Pioneer's DEH-P6000UB couple months ago. . I also installed new componet speakers, amps(Alpine MRP-M500 & Kicker ZX200.4), and 2 subs(KFC-W3012) that i had purchased from a different website. Well, since day 1 i have been having problems with the amps shutting off at high volume. I have already upgraded to a high output alternator and did a big 3 upgrade. Still, i have the same problem. Another thing i did was relocate the grounds on my amp and its still doing this. My question is, when i installed my receiver, i didn't ground it to chis directly. I just connected it to the black wire from the harness. Should i go back and ground this directly and could this be my problem?