What you’re describing would most likely trigger a 500 / 503 error, not 504.
It’s more likely that either your hosting doesn’t have a reliable enough infrastructure to be able to handle the Manjaro traffic, or there’s some aspect of discourse that is phoning home on every request, and said home can’t keep up with all of our traffic. If Manjaro is being hosted on a cheaper droplet (I hope not!), then the latter is more likely.
Either way though, this is easily fixable by someone who could check the server logs, and respond accordingly. Upgrading hosting would not fix the issue unless they moved the server to a different server rack that for some reason had better internet connectivity and that was causing the issue. That doesn’t really fix the problem though, just masks it.
Either way though, It’s slowly driving me away from the forums. I only browse the forums for 5 minutes or so a day anymore because it’s basically just dead during the times I would normally use it.