Would you like to share how you fix that?
Everytime I get touch issue, I just reopen apps or turn off screen and turn on again.
but as you said “it comes back again”
Touch issue: the touch will either semi-register or fail to register at all.
Semi-register is either intermittent register fail or certain areas will fail to register while other areas of the screen work fine. I use an ASK most time as it always works. The Pencil usually works at all times.
When I have touch issues I go through a couple of steps. The touch fail is a screen, not an app issue.
1. I will shut off the screen and turn it back on.
2. I will reboot the iPad.
3. I will hard reboot the ipad.
4. I will give the device a gentle flex - convex works better than concave.
5. Worst case - wipe and restore.
Usually 1 or 2 will work. 3 seems to work seldom. 4. works pretty well. Have done 5 more than a few times.
Interestingly, if I put it on charge and wait overnight, the issue is gone in the morning.
Sadly, the touch issue comes back withing hours to days. I have been through a few replacement devices and am able to demonstrate to the rep at the Apple Store.