I too would see the "Looks like your connection to Netgate Forum was lost, please wait while we try to reconnect." message, but only if I let the browser window fall to the background (while doing something else). As soon as I came back to the forum, the message would stay briefly, and then disappear! (I would never have to log in again though) Was using Firefox/Windows 7, but since switching to Linux Mint 19.1/Firefox, have not seen the message.