sharkbait, it may sound a bit heath robinson, but take the whole thing apart, clean it thoroughly, check all the electrical connections, grease all the threads, and put it back together.
Mine stopped working after only a few minutes use. There was obviously a poor connection somewhere. I did all the above, and it’s been fine since. Though in fairness 2 days and still no response from them isn’t the greatest customer service!
fastindian, if it’s in stock, usually takes about a week to 10 days to arrive, based on my experience of 2 orders from DX so far.