Pen freezes

Am I the only one? Every now and then S3D on ipad pro stops reacting to the pen. It does react when pointing to the menu’s but does not react when working in the design area. (Oh and then moving the design using gestures stops too).

Only option left is to stop and restart the design process, but that makes that you loose your ability to undo changes.

When it happened to me, it really only prohibited work in the design area of S3D. The menu still functioned with pen and fingers, but any manipulation of the design (selecting bodies, moving or rotating the design) either with fingers or stylus, doesn’t work.
I only need to close the design (that works with the stylus), wait for the sync, to start, open the design again and everything works as. It should.

That’s only happened me once, recently. I docked the pen for about a minute and it worked fine after that.