strange behaviour in Share process

This has happened to me four times now. On the 60-minute doco I've had major problems with recently ( and thanks to all for getting me through)

When I Share to Apple Device ( iPad) all goes well until 95% when the process just stops.
Stuck on 95% with the time elapsed and time remaining stopped as well. Everything else is OK - no freeze or anything.

It doesn't happen every time and it doesn't happen when I Export Media

I cancel the Share and then redo it. It remembers the 95% finished and does the rest in a couple of minutes. Which is nice. But kinda weird.

Any thoughts on this?

I had it stuck at 95% already several times, but the project had still finished exporting. Was for YouTube though.

Export as regular QT (Cmd-E) and convert to iOS device in QT Player. Much faster.