In my opinion your problem may be is the same as the previous problem of which I experienced.Some fridge freezers as liable to trip intermittently, because 30 milliamp on the residual circuit breaker (rcd) is a very low sensitivity on the socket circuits, but that is the regulation for domestic installations and has been for some time,the reason is if there is a faulty appliance, the socket circuits will trip out before you can get a shock.
It does not imply that your fridge freezer is faulty.I wired a designated socket circuit without the (rcd) purely for my fridge freezer and everything worked perfectly and you may have to do likewise. I am an elecrician, hoping this advice will be beneficial.