My 2006 XTX used to do this, usually when going down the box approaching a junction / roundabout. Was very unpredicatable, might do it a couple of times in close succession and then not again for ages. Just got used to it and dipped the clutch and started her again. Happily it's gone away now that i have MTC cans / PCIII / Stage 1 & 2 filters. I know it's been posted about before and is not uncommon.

Not that any of that babbling is of any help to you.... hopefully a grown up with useful advice will be along soon

SelinaXT