hello dont know what model you have but this may help
hope this post helps you save a lot of time by not messing about trying all the weird and wonderfull help/tios that you can find on the internet
we have tried every help/tip thats availabale on the internet reguarding this problem - but you cant solve this without replacing faulty parts ... yes you can keep appliance working for another month by defrosting it but this is only really delaying problem ..
we came across this guy on you tube who is an expert on samsung fridge freezers he is authorized samsung repairer and has repaired over 3000 appliances..
http://www.youtube.com/user/SamsungFridgeFreezer
we explained what we have tried so far etc , and he said everyone says the same thing ..bottom line is there is no quick fix - the only way to totaly cure fault is to replace the faulty components .. he does a kit which is available on ebay ...
RS21 KIT Item number: 280596204942
RSH1 KIT Item number: 280583238579
if you check this guy feed back you will see how may people he has helped ...
calum
January 2011