Daewoo fridge freezer won't stay frozen??? ?

Hey my daewoo fridge freezer (American style with ice and water) isn't working right, it stopped working for some reason one day, tested the fan it worked fine, any way we moved house so had to turn it off for a few day and it defrosted it's self (not that it had any frost) when we plugged it back in on Saturday the freezer was working perfect again and making ice again but has since died again today??? Not sure what to do, can you help. Cheers Tam