I'm having a very strange issue with Exchange 2016 CU8 OWA. When users login, the Inbox constantly refreshes every second or so and it makes it impossible to click on a message or do anything for that matter. I've tried on different browsers (chrome, firefox, IE) on various endpoints and they all have the same issue. I even tried it by logging into OWA on the Exchange server itself with the same result.
Other folders like Deleted items don't seem to have this issue. This is a brand new Exchange 2016 installation. Originally I thought maybe it was related to the HTTP to HTTPS redirection so I put everything back to default but the issue persists.
I don't see anything weird in the logs and google search does not yield anything useful.
Everything else seems to be working correctly (activesync, outlook anywhere etc.).
I would appreciate some help on this.
Thanks a lot