Conversations view stops updating even though emails can be seen in the Individual view of the inbox

I’ve been having an ongoing issue since notes 8.5 and now on notes 9.0.1 where setting my inbox to the conversations view may work for a few hours, but eventually stops updating. If I switch the view back to individual, then I can see all the messages that have still been coming in. Switching back to conversations view will end up hiding those newer messages and only display emails up to the point where it stopped updating. I’m at a loss for why it’s doing this and I don’t have “show only unread” marked, so it should be showing me everything in my inbox.

Any recommendations?