Why does Roon go into Restore mode?

Occasionally (regularly?) Roon will be playing for a while and i will come back to the PC to access Roon and find a blank screen. At first i restarted Roon thinking something failed. They i noticed the “Restore” option under the Roon name and logo in the top left of the screen. When i select “Restore” all comes back.

Is this normal? Is it designed to work like this? This is a curiosity and not a complaint.