compressor non-start

Hi
I have a refrigerator that every two hours will fail to start the compressor and a quiet buzzing sound occurs. The buzzing stops after half a minute or so, giving up trying to start the compressor when it does. If I go unplug it and wait approximately 1/2 hour, it starts up fine with no buzzing. The fridge is great, nice and cold. The schematic shows it has an overload PTC Relay and I have replaced it, which changed the amount of time it took for the compressor to have a failure with the buzzing to three hours instead of two. If I leave it plugged in it just buzzes for 30 seconds and then quits and then 10 minutes later it buzzes again and so on. What could it be? The schematic shows the external capacitor as a run cap.

it sounds like the internal thermal protection klixon is stopping the compressor, when the comp reaches a preset temp the thermal overlaod cuts the comppressor what is happening when you unplugg the fridge is the compressor cooling down then when you plug it back n the temp rises and the comp trips, so to me you need a new comp or a new fridge

I will translate it for you,

In refrigeration language, buzzzzzzzzzzzzzz = replace me...;)

your ref is nearly to wall or over charge of gas, or high voltage, or if compressor is overheated with in 1/2 hr since cool stage that is compressor's centere shaft complaint.(compressor deffective) or non specified o l p