iPad Pro Loss of Touch Sensitivity

We have two iPad Pros that are exhibiting the same odd behavior with loss of touch sensitivity and odd keyboard behavior. My wife noticed that for her the problem appeared with iOS 11.

I first noticed the intermittent issue on my iPad several months ago and I've tried the usual fixes

- Restarting,

- Hard Reset,

- Performed a full erase and reloaded my data from a backup using iTunes on my MacBook.

Nothing seems to have worked.

In reading another thread on this topic the user mentioned that this problem appeared when they were touching the bezel of the iPad as he attempted to type/touch on the screen. I tried to duplicate this and it appears that the problem disappears when I'm not touching the bezel and reappears when I am.

Both iPads are 3 years old and in generally good shape. They haven't been dropped or abused as they're mostly used as home but we have taken them on trips with us.

Any ideas for a solution?

Is it a problem with the screen or possibly with bad wiring that causing a short?

Thanks in advance for any suggestions....