My symptoms were similar, and the cause was that the pipe that the fridge uses to draw cold air up from the freezer, to cool it, had blocked (frozen). All I had to do to resolve it (a 2 day full defrost would have worked, but I didn't really want the inconvinience) was to blow a hairdryer (on a...
Well that's fairly shit advice, for starters.
I fixed mine no drama, thanks to helpful advice from the afforementioned hard man.
What is the problem with it, Trigaaar?