Oh dear another one :~( We had same problem and then the whole thing went haywire. It is probably a compressor problem and this is just the beginning. I had nothing but problems with mine and after it being written off by a Zanussi engineer who also told me that this particular model should have been recalled, I went back to *****'s (think hot food)and complained. They refused to do anything as it was just out of warranty.
I then went to Trading Standards who informed me of my rights and options. I ended up filing a claim in the small claims court but surprise surprise they settled out of court and i bought a new fridge freezer elsewhere. Good luck with it all
Donna, October 2007