If ice is accumulating in the back of your RF26XAEBP, please make sure there is nothing blocking the vents in the back of the fridge or try raising the temperature. Samsung recommends setting the refrigerator and freezer temperatures to 38°F and -2°F, respectively, but they can be set higher when necessary in some situations.
Some noises the refrigerator makes are normal and can be minimized by properly leveling the refrigerator or making other minor adjustments; others may indicate a need for service. I would suggest you visit the Troubleshooting Guide through the link below, then select "Troubleshooting ► Noise/Vibration" to try to identify the cause and possible solution: http://support-us.samsung.com/cyber...
If the suggestions and explanations do not resolve your concern, please contact 800-SAMSUNG to speak with an agent who will be happy to assist you further.