Used this grinder a few time over the past 18 months also, cutting odd bits of metal now and again, today whilst renovating cutting an aluminum window frame and was by cutting foe less than 30 seconds it decides to cut out, thinking it was the battery (only had a 3.0ah) I put on big bertha (5.2a ultra performance) and it started and stopped intermittently.... after reading some posts it seems that the brushless model has an issue with the switch and Bunnings no longer sell it....I bought the brushless version thinking it will last much longer than the one without, and I don't have the receipt anymore as it was some time ago.... what do i do? How can I claim the 5 year replacement warranty? Any help would be great thanks.