I've had occasional problems like the OP mentioned with freezer cooling, but fridge not or little. In each case a quick look showed a flame that was yellow or very small. A blast of air in the tube to the flame and taking the propane orifice off and cleaning fixed everything. The flame for a fridge is very small, and a very small orifice, so it doesn't take much debris, rust, spider web, etc. to plug it up.
My "spring cleaning" each year is to take the orifice off, clean it out, and use compressed air to clean out the tube for the flame.
