Of all the Samsungs installed, I only heard of one with an issue. It was never installed because the person didn't measure correctly. The unit was placed in the garage as a second refer for the house. The refer side would not hold temp properly. Samsung serviced it several times to no avail and returned the owners money, leaving them the refer.
There is a recall on the Samsung though. Behind the panel at the back of the refer (inside) is a drain tube. It can be pinched by a bracket and cause the refer to not drain and freeze the tube. The bracket has to be adjusted...not sure of the exact description, but the recall can be found online.
We had ours in operation for over two years and 10000 miles before we sold the coach. It was a great refer. Even though it didn't have water and ice in the door, it had a huge ice bucket that probably holds 5 pounds of ice. Was great for boon docking when we would turn off the ice maker.