Hi this has been happening from the beginning of our install. We have V2.2.0.beta5 on digitalocean server.
The occurance is random we thought at first that it could be an issue with upgrades so we stopped upgrading discourse as soon as the update hits. Still, this happens again.
When I see in console log it shows “Failed to load resource: the server responded with a status of 404 ()”
I searched the forum and never found anyone with a similar issue.