Gas fridges that operate on butane/propane/natural gas are 'absorption refrigerators' , do not have a compressor and have no moving parts. Don't confuse the gas with the refrigerant 'gas' as they are totally different.

One common 'fix' for this type of fridge is to turn it off, empty it, leave it for an hour or two then turn it upside down. Leave it 30 minutes then put it back upright again. Leave it 30 minutes then light it again.

This re-mixes the chemicals (mainly ammonia) that are in the refrigeration circuit.

This doesn't work with electric fridges!