I have had what sounds like the same problem for over a year with my Samsung RF263 refrig. It makes very loud popping noises like expansion noises when heat hits your house siding or a railroad track. The noises are loud enough that they actually startle people, and our cat. I had a repair man in last May 2013 but no luck.
I finally did a lot of listening, testing, etc. and found the problem. I noticed it would occur whenever the compressor came on. I thought it might be ice build up, so I took the cover plate off over the evaporator in the back of the refrig compartment. There was no ice build up. I then left the cover off and wiring attached and no noise after a day. After a few other trials I added some more weather stripping to increase the distance between the evaporator coils and the cover plate and that help quite a bit but not totally. I still get a pop now and then. Another problem I noticed with this partial solution is that it causes the shelving to not be aligned. A 'V' gap forms between the shelves and they droop a little. I'm still trying to figure out how to fix this but haven't had any good ideas yet.
This is a very annoying problem and a design flaw in my opinion. Whether Samsung has a solution for it I don't know but I plan on checking before my warranty runs out.
Dan
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