Amplifier going into power protection mode

[LongThrow]

I have a sony xm502z amp. I was bumping today and all last week and my amp suddenly went to power protection mode. It now turns green when I turn my amp on and then turn red after a few moments. I Finally got it to stay on but when played at high volumes it shuts off and goes to power protection mode. Using 8g scorsche wiring. 10 inch kicker comp 4 ohms. Before my amp shuts off my sub produces a constant rumble sound

What would cause this and how do I fix it?

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[Spl4200]

Double check your wire and ur connections. Most likely a ground.

 

[Spl4200]

Or a voltage issue? Bad altanator or battery?

 

[LongThrow]

Brand new battery, alternator is fine. Could be a voltage drop but I don't have a dmm to check. I'll post a picture of my ground location sometime today. Yesterday after I posted I was able to get it work for about 10 minutes bumping no problem, then out of no where my headunit shuts off and now it won't turn back on.

 

[big scott]

my sony amp did that. its gone get a new amp and dont get sony.