Samsung American style fridge/freezer temp problems

[mumdawn]

Our fridge freezer seems to do all the right things to get down to the relevant temperatures in both fridge and freezer compartments. However, when it gets there it does click back on to maintain the temp,so overnight it thaws out the freezer and the fridge warms up.
If you hold the doors open for the temp to drop it seems to recognise that the temp has dropped then.

The only way we can maintain a stable temp is to turn it off at mains and switch on again.

this sounds very computer like to me!
We have called out an engineer who is used to mending fridges but is stumped what the problem is.
I am loath to call out someone else if all it needs is a printed circuit board replacement at back (saw one replaced when it was under guarentee) or the control unit at the front with the led display.
I have been involved in building computers,but don’t know anything about fridge freezers.
Would really appreciate some advice.
thanks lots

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