Thanks again for letting us know how your touchscreen's been doing after trying safe mode or resetting your tablet -- it's helpful to know that hasn't resolved this issue for you.
The Android team is aware of this issue and investigating. I'll post an update when there's new information to share.
(FYI I'm going to mark this post as an answer to this thread which means this thread will have an "answered/resolved" flag on it. I understand that this issue is not resolved for all of you; I want to ensure that my update appears at the beginning of this thread so newcomers can see the latest update from me and marking it as answered "pins" it to the top of the thread.)