Norcold DE0051 frig works, then not

I have a DE0051 frig that is over 10 years old. Will work just fine, nice and cold on one trip. Then at some random moment, it will start just fine (precooled and all), the motor will just run and run and run, but the inside starts to get warm. When I get home with a warm frig, I sometimes just try it one more time, and it starts working again. When it decides stop cooling, you can hear the motor run for a while, stop for 10 seconds, run some more, repeat. Any guesses??? When it works, it works great, but now we are gun shy because in the middle of a camp out it just randomly will quit cooling but the motor still runs.



thanks

Andrew

Norcold DE0051 frig works, then not