when you are actually moving??
so changing down from 5th to 4th for example??
Mine would only cut out when moving if i shut off quickly. Classic was coming into lights or roundabout and not expecting to have to stop so shutting off and grabbing brake whilst trrying to change down quickly. but even so as I was either coming to a standstill or stop it was not an issue as i just hit the start again (don't try dropping the clutch and hoping it will bump - it just ain't gonna happen ..
)
I now ride it differently and have adjusted to shut off more progressively and less sudden and its far better.