[palosanto]

Let me know if you want to try the latest BOOX libraries to see if it improves the issue for you as well. I can email you a link.

Mike

Sure, I'll be happy to try it and report back.
Thanks

So far so good ... I haven't had any strokes disappearing and the bottom of the page seems much more responsive and snappy, (it used to be sluggish).
But I'll keep observing because sometimes it doesn't happen until after being annotating for a while. 
Thanks Mike.