A factory reset (while still within update period likely be the fix, however you got to wonder how well the battery is doing after 3and a half years? Also downloading all the software one app at a time takes quite awhile and device gets pretty warm . I actually wrapped a plush cotton towel around a large plastic block of blue ice from my freezer to keep tablet cooler downloading and reinstalling 30 gb of updates. I would be curious of what a thermal image of tablet would look like after being fully charged , and wonder if the soft battery inside it as it has aged as it might have swelled somewhat in size and is creating pressure points that could affect the board or touch screen? Don't open it or you void the Total Care of the update subscription.
https://www.youtube.com/watch?v=SjkQB0otK58
I installed a Device Info HW app on my Maxi Sys Elite using Quick support App and Team Viewer of my PC . It tells me that my battery health is good and temperature of battery. The removable battery outside is labeled as 15400mah, but Power profile the app shows is only 6750mah, so I don't know if I believe the Russian that made the Android Device Info HW or the Chinaman that made the battery, so I guess I'll add the 2 together and just divide the sum by two . LOL.
https://www.youtube.com/watch?v=uqpNPqIXbsQ&t=553s