I’m not sure this update is helpful but thought I would share. The problem seems to have gotten worse and is now requiring me to re-authenticate multiple times a day. I’ve also noticed that even when I am authenticated, it doesn’t seem to be syncing properly (e.g. I archive mail but it doesn’t get sync’d so when I open it up again, those emails are still in my inbox). That could be because it times out so quickly… 
Thanks to everyone who is able to contribute to the investigation and solution. 