Samsung SR-S2028CVW fluctuating temperature?

Hi I have a Samsung SR-S2028CVW fridge freezer. I noticed a pool of water by the freezer door and all the ice in the ice machine had melted. Also the temperature quickly rises from -20 to -1, then gradually decreases to -20. During this time all the systems work normally and the ice machine produces ice. Then after between 6 and 12 hours the temperature rises almost instantaneously to -1 and then gradually decreases to -20. I find this a bit confusing as when the power is turned off the freezer maintains temperature for up to 24 hours as we noticed in a recent power outage. Is this a problem that can be easily and economically repaired.
Regards
Motters