Perspective Mobile - Top dock scrolling when swiping down page

v8.1.47

Unsure if this is a bug or just something with my setup, but I have the Perspective app installed on a samsung phone connected to a project with a top navigation dock and page content that is taller than the phone viewport height, so obviously you can swipe down to view the rest. However more oftne than not, the dock disappears from view as well. When the client is first launched, it's generally ok. It could be when I switch apps and then come back to it after a while that it happens, I haven't worked it out yet. But it's very annoying!

I'll try to get some more info