Sonarr Suddenly not working

Sonarr was working fine last week. At some point over the weekend it stopped working. Now I get a red light on the status page for it and the link is gone. If I go directly to the page I get an error below

" Service Unavailable

The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later."

Anyone? I don’t want to have to reinstall and loose my settings and database.