I updated the system to UI 7.0 yesterday and since then everything is buggy.

Most annoying is the SPen - in any of the writing apps - Samsung Notes, Noteshelf 3, and others, whenever I'm writing, at random some of the newly written text flickers. Sometimes it's very light, sometimes it's the whole thing blinking in and out. 

I've updated everything, cleaned cache multiple times, restarted multiple times, reinstalled even a number of the software and still the issue persists. I really hope Samsung releases fixes ASAP. 

If anyone has any ideas of what I could try to fix this - please let me know.

There are no screen protectors, or magnetic covers on my tablet, so nothing is in the way of the spen to work properly.

It's strictly and only when writing.