I had a very similar problem with Carbatec, an Aussie company. This was a quite a few years ago. I purchased an Ex 21 and it gave up the ghost after a few weeks. I rang them and they said to return the saw, which i did. cost a small fortune, as I am 600km away. After about 4 weeks and me ringing constantly I rang the Canadian supplier. They arranged for new saw to be sent from Taiwan, direct and it took a week. Carbatec still have my original. Under Aust. consumer affairs legislation a company must have a repair completed within a reasonable time (usually a week, or 2) and if it is not done a replacement item or full refund must be given. I have since found out that if the fault is theirs, the company is also liable for postage fees both ways. Hence I have never purchased another thing from Carbatec.