Samsung refridgerator regularly beeps with power freeze switching on and off

SOURCE: refridgerator beeps and upper section not working

First, the Samsung Refrigerator is the only fridge that has one compressor, but two different evaporators to operate the freezer and the refrigerator separately. Thus, you can have the bottom freezer working fine, while the fridge part will not.
The reason your fridge is not working is probably a faulty door switch in the refrigerator. The switch is malfunctioning, telling the computer that the door is open. Therefore you hear the door alarm go off in intervals, even though the door is actually closed. If the computer registers an open door, it will not pump cool air into the refrigerator, as that would be a waste of energy. All you need to do is replace the door switch. Until you get a new one, you can temporarily fix your fridge by simply removing the old switch altogether. You will not have any light in the fridge, however, it will cool again just fine until you are able to install the new switch (a simple plug-in contraption, by the way).
Hope this helps.

SOURCE: Samsung RB1855SW won't stop beeping and fridge malfunctioning

Thanks so much for the advice. I just gently pried the door sensor switch on my Samsung RB1855SL out with a butter knife and then pulled out the electrical connection and it fired up right away. It looks like some orange juice seeped in and corroded it. What a relief to have the fridge working again, not to mention to not have to listen to the beeping.