A batch (quite large I think) of Zulus had problems with the wiring. A lot of these appear to have come to Australia. Mine also cut out (probably also around 30 hrs). I too had lots of problems - mainly because I did not buy them from an authorised dealer. I think Tristar is the only such dealer. Anyway, I only got them fixed when I wrote to the head office support address asking to return them for a refund. They then arranged for them to be fixed (through Tristar). It is worth getting them fixed.