Shiny app server disconnecting

For some reason, one of the tabs on my live Shiny app keeps disconnecting from the server when I click on it. The app works fine when it's local. How can I fix this?

Check the Debugging Your Application and Troubleshooting sections of the documentation for help in diagnosing disconnections.

Tried many different methods but it still doesn't work...still getting the "disconnected from server" message.