On the pics I see that you have the early model Funduro.
The fitting of the sprocket onto the gearshaft with only a circlip securing it is very problematic.
Take suitable circlip pliers and take spare circlips (the right ones!!!)
Check the circlips for proper seating and clean gunk away on a regular basis.
I had a circlip & sprocket coming off at 70km/h in a slight left hander in Dock Road in '99. The chain seized between the rear sprocket and the rear wheel and locked it. I came to a standstill on the bicycle lane after painting an undulating 42m skidmark. Still atop luckily as there was nothing in my way and nothing too close behind and of course I was in full riding gear (=shorts, t-shirt & fli8pflops)
:-)
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