Fridge compressor problem ? I have a 12v isotherm upright 125/50 litre frig/fzr with bdf50

Question

I have a 12v isotherm upright 125/50 litre frig/fzr with bdf50 compressor.3 yrs old. For the last few months when compressor shuts down, it almost immediatly starts again and runs /stops for a few seconds over about 1 to 4 minutes before stopping for whatever time it takes to start its cycle again.
where do I start looking? Thank you.