Furnace won't cycle back on regardless of temp

If it is mounted in an out of the way place or inset where normal airflow does not pass it by you may have dramatic swings in the on and off cycle. I had to move mine in my last RV. It was a matter of a few inches around the corner but it worked great after that.

If yours is in a small alcove, just let it hang by the wires into the normal air space or use some temporary method.