Design layout completely disappearing

Hi there, I've searched the community and the web for this glitch and can't find it. unfortunately the latest updated to both software and OS haven't fixed this.

Basically, if I leave my design for a little bit, and then come back to it (say after a meeting)
I find that as soon as I tap the page with my cursor – the entire layout (all pages) disappear. Everything else is still present including my pages column on the right. But the only thing that seems to bring it back is saving and restarting the programme which obvs isn't convenient.

Anyone else experienced this and/or has a fix?

Many thanks
Carolyh