Focal FP 2.150 protection mode

I have a Focal FP 2.150 amp (actually two but only this one is having issues) that is turning on, playing, and then shortly after will go into protection.

Let me start by saying that I used to be a professional installer and the install is good. Positive for three amps comes from a dist block and grounds all go to the same JL Audio ground post.

I SWEAR that the amp was doing this when I would hit the brakes. I don't think that's actually the case anymore. I pulled the speaker outputs first and it still went into protection after a few minutes. So, I pulled the RCA's, and it did the same thing. So basically the amp just turning on is sending this thing into protection. I have the schematics. Where do I start?