You should have an option so the mobile app session does not time out. Have an option to load on start up.
Sessions keep expiring and you'll miss a chat. Have some keep alive options, load on start up, etc.
Arthur James commented
I had the same the session timeout error on Befunky. I could not create any projects, because every 10 minutes the error message popped up and I had to login again. This chat is the same.