Fridge not working on propane

Had a nice camping trip to Macedonia State Park in CT. No water, no pumpout, no dogs :(   but great sites.
Slight problem though.
Fridge got nice and cold at home on AC. Switched it to propane for the trip. Seemed like it was working... it wasn't. Everything defrosted, melted, etc. Put it on battery for the hour and a half ride home and it  cooled right down. Switched it back to propane at home (could hear the flame and smell the hot flue gas) and the fridge warmed back up. No error codes, flashing lights or anything to indicate a fault.
What gives?
This is our third season with the pod and never had any issues before with the fridge.

check for wasp nest?

Forgot to mention. All other gas appliances worked fine - stove burners and hot water heater.

Had the rubber gas line pinch once and the stove didn't work. I don't think that's it this time.
The flame lights and hot gases come out the flue. I've been reading online about cleaning the flue, etc. but not sure if this applies to the rpod fridge.

Originally posted by john in idaho Wasps and leaf cutter bees work havoc on small spaces and holes, tubes, etc..  Leaf cutter bees and orchard mason bees were the main pollinators before the honey bee was introduced to the eastern US in the early 1800s, and are supposedly more efficient than honey bees.

John, not sure what you mean.  I've got the same problem, and would love to know where to look for these efficient insects!