This intermittent, unresponsive touch screen issue affects a continuing, growing minority of iPad Pro users/models across all 4 years of iPad Pro models, as well as the new 2019 10.5 inch screen iPad Air 3, which is based from the 2017, 10.5 inch screen iPad Pro models.
Take a look at these long standing, longer posts on the subject of this intermittent, unresponsive touch screen
issue, below.
There is STILL no “official” confirmed iOS updates, solutions/fixes, from Apple, after nearly 18 months, now!
None.
That is because this issue is either STILL only affecting a growing, but still very small minority of iPad Pro users OR iPad Pro users are simply NOT reporting this issue enough here in these official Apple iPad support communities OR simply NOT posting enough feedback to Apple about this intermittent, unresponsive iPad Pro touch screen issue to alert the proper responsible and cognizant Apple employees and teams and get them working on this iPad Pro touch screen problem.
iPad Pro touch screen intermittent unresp... - Apple Community
https://discussions.apple.com/thread/250085450
iPad Pro screen unresponsive - Apple Community
https://discussions.apple.com/thread/8658399
iPad Pro 12.9” not responding to touch in... - Apple Community
https://discussions.apple.com/thread/8396370
There have been many, MANY more posts than these three for the past 18 months!
These are just the longest active and running posts, to date!
For quite some time, these intermittent, unresponsive touch screen posts were, at least, 2-3 a day and some days up to a dozen, or so a day and I fielded every single one of these posts through out the 18 months this issue has been going on!
Also, see my two postings about this in the Lounge, also.