Helppppp. Its really grinding my gears!.

[Screwhead]

So i have decided to connect my aftermarket stereo on my 01 Yukon. After i hooked it up, i noticed that the cd player skipped with the USB playing or any function at that. I checked all my wires, re checked them again and again i just cant seem to find the reason why its acting stoopid. If i brake the music stops , not all the time just sometimes. I turn the key off and the stock amp goes out.. anybody know what could it be? Ive tried two stereos and they both did the same thing..

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[Screwhead]

I really can't explain the problem. It literally has me all types of confused. Lol