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I'm kind of stumped.  So I had blown what I believe is a head gasket on a third compressor.  I tried to blame the other ones on overheating due to a failing of another component or the like, but this time I'm really scratching my head.

So last Thursday afternoon I replaced yet another compressor and I also replaced the a check valve that is just above that little module that releases the pressure back against the head.  Replaced that check valve as I had a little bit of air seeping back towards the compressor.  I absolutely have the check valve facing the right direction of basically air being input into the coach.  So I take the coach home, got all loaded up and washed up and noticed it came on a couple times over the course of 6 hours or so which seemed about right based upon how much it had been leaking down in recent history.  Went out in the morning and felt compressor and it was just barely warm as if it had run maybe an hour or so prior so I figured things were heading in the right direction.  Drove 5 hours to my destination and was there a couple hours and was back at the coach and heard compressor come on.  Again thought that seemed about right expept after about 10 minutes it was still running.  I go out and it's obviously super hot at that point and I also noticed yet again I had massive amounts of air escaping in between the head and the compressor in the port just to the right on the exhaust.  Same thing happened on the last two compressors.  

Any suggestions on what could cause something like this to intermittently happen would be greatly appreciated.  Compressor had maybe an hour of run time on it.