I think this started happening back in August when we updated to the current version (18.104.22.168.0). We are not sure though because this only affects the web page externally. Internally, everything is fine. We use Azure Application Proxy to allow access externally. Unless we do a ctrl+f5 to fully refresh the page, we will get this error. I have even seen it through a few other errors. I can understand if this is a "not adaxes fault" answer but we know this worked before and now is not working and reaching to try and figure this out. We would prefer not to allow access through a firewall for this.
Screenshot of the error: