Navigraph in browser constantly disconnects unless I refresh the page

I primarily use Navigraph in my browser. Usually it’ll be fine for the first 30 minutes of flight. But at some point, it’ll eventually do the usual “Cannot Connect to Simulator” bit. I’ll re-click the “Enable moving maps” arrow icon but it won’t connect. The only way to fix it is by refreshing the page. This is at the very least a minor inconvenience, but it can be a real hassle when I’m in a busy phase of flight and the web app simply isn’t reliable.