Samsung Refridgerator w/Drawer & bottom Freezer......

this is common with bottom freezers. the line that allows moisture to drain into the evaporation pan in the rear clogs at the tip and the water that would drain out stays and freezes all the way to the bottom of the freezer. you can fix it yourself by thawing it and then opening the back to access the drain line. there is a duck bill cap on the end of the drain line. clean it out and cut a V into it to keep it from clogging again. there are many youtube videos on how to do this and where things are located. this fixed my last fridge. if under warranty have a tech do it but its not too hard.