Sketch Mode Freeze after zoom in and out whilst in the Sketch mode

[Fallenius 2]

I have a Samsung Galaxy Tab 6. I use the Sketch Mode to take notes. I zoom in and out using pinch and after a few pinches and and out, the mode freezes and I can ot take more notes. I can still move the image around and I have to close and save and open up the note again to continue. Please advise as this is not a workable situaiton for me. 

[MAVC 1]

I have exactly the same issue with Samsung Tab S7 - any solutions ?