Menu bar disappears now and then

[Esp32-zapper]

A rather new phenomenon.
Only noticed it on android mobiles in portrait mode.
When you go back and forth between main page and room pages, suddenly the bottom menu bar disappears. Does not help to go to a sub menu and back again. If it's gone it's gone and the only way to get it back is if can jump out to standard gui some other way and restarting Dwain's from the side menu or killing/restart the companion app.