To clarify, Edge is like Explorer, but it's what was included with Windows 10 computers, and it works slightly differently. I have a couple of reports of unintentional logouts, but one supposedly resolved itself when the browser released its last update and the other began with the last update. O_o
If you are running Windows 10, likely with Edge, though perhaps with Explorer if you made a point of downloading it separately, and you are getting logged out at random intervals consistently (daily or several times a day), please let me know when you experience the issue, how long it has been going on for, and what versions of Windows 10 and Edge/ Explorer you are running, so I can try to troubleshoot more.