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It may not affect every frame because (potentially) the mechanicals are sticking - either due to friction or interference or misalignmen tof bearings or shafts
Steppers simply get pulses and they step - if they are jammed or under too high a load then the pulse may not have any effect or may have a partial effect.
The stepper motor that drives it may just pulse so many times and assume its fully rotated without checking its position or maybe there is a problem with the sensing - I am not familiar with that camera or its design.
The repetition here could be that it requires two attempts to drive the shutter to complete one successful shutter cycle - its just a guess !
Or maybe if its a rotating double shutter wheel, then it may be that there are two sides (cutouts) to the shutter and one side doesnt jam as it turns but the other side does.
(edit - oops, sorry I see Terry already said that)
It does seem surprising that there is no error reported or verification by the system that the shutter ius doing what its supposed to do - but it may just assume that its always doing exactly what its supposed to do without checking - since fast exposures are just that - fast.
But to have something that jams occasionally in a tight spot but not always is not unusual in delicate instruments when there is interference
Pete
Have you dismantled the camera recently or done anything to it ?
Or dropped anything into it ?
Rally
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