OWA Reverts to Inbox Automatically

Recently I have found that OWA reverts to displaying the Inbox message list without any user input.  For example, if I open the full text of a message, after a few seconds OWA goes back to the Inbox message list on its own.  The same happens when I check a message that I just sent by opening it from the Sent list.

Has anyone seen this behavior or know how to fix it?  Thanks.