Amp going into protection mode

After searching former post on the subject of Amps going into protection mode

I have come to the conclusion my Memphis 16-MC500D amp in my KIA SUV is dying, it had been working flawlessly for 3 months until today when it was going in and out of protect mode at any volume

So correct me if im wrong on the reasons that an amp would do this are:

1. Bad Ground?

Did I get them all or is there anything I overlooked

Now its time for that dreaded RMA back to memphis.. oh the joy

Thanks All

---Skold 

Elaborate please..  The speakers work fine on my Brutus 1500D in my wifes car

Thanks

Use a DMM and check the impedance of the speaker. Keeping in miund how you believe it should be wired.

2 ohm, 4 ohm...8 ....etc.

Each Speaker is 3.67ohms most commonly refered to as 4ohms, in fact out of 10 speakers including some JL , MTX and RFs that I tested at my guys shop that said 4ohms on the box read from 3.6. to 3.8 on the DMM

I thought of it being too low of an impedence at first and then we hooked up a speaker to it that was 4ohms one at a time and it still had the problem

Nope its a clean mount to the back of the rear seats I used 3/4 MDF under the seat fabric and its screw into that, all wiires are firmly attached with no room to wiggle

The only other thing I might have thought was my relay but I disconnected it and it still goes in and out of protection mode

More Ideas?

Im getting a loaner amp today while I have Memphis Repair this one.. damn 6-8 weeks wait time

The most common cause that I know for this is HEAT!

'Resistance causes Heat & Heat causes resistance'

I've had a couple of Amps do that, Is it packed away in the deep dark depths of your car with NO AIR? - You know what happens to dogs if you leave them in Hot cars!

Computer Engineer!-Wire in some 12v dc Fans. Like the ones in your computer.