Mine was doing the same thing got fed up changing it only for it to happen every couple of months and it would happen when the warranty had run out typical after a few frosty emails the manufacturer finally cave in and send out a one of their agents who service the London postcodes www.agsrefrigeration.co.uk who found that the fault was with the manufacturer in the first place their was a missing earth connection i think they will be compensating me for all the lost of food now that it has been proven the fault was theirs.
Ed
May 2014