Notification popup on Lovelace wall panel

I have three wall panels in my setup. One of them consistently has popups that appear without interaction as if I had tapped and held on a button (more info popup). I have swapped out the tablet and the wall frame thinking that something was causing the tablet to think that someone had tapped and held the button but no joy.

What would cause that to pop up, always on the same wall tablet, without provocation. It has happened on two tablets at the same location the only commonality is the Lovelace login that the tablet uses.

If be eternally grateful for suggestions because this one has me stumped