On the toolbar, there's a magnifying glass icon that I'm calling search.

I enter the search page by clicking on that icon.

On the search page, there are a number of communities, and at the bottom, there's a Random Community button.

When I click on Random Community, I am sent to !100yearsago@sh.itjust.works

So far so good.

When I backswipe to go back to the search page, and click on Random Community again, I get a yellow error dialog saying "Failed to find random community"

No choice but to go back to the search page.

Random Community again returns me to 100yearsago

Back and Random Community gives me the yellow "Failed to find random community" dialog.

Ad infinitum

Edit: I am using Android v2.9.1