Error after loging in to Admin portal

Good morning. I keep getting the following error when I log in to the admin portal and the dashboard comes up.
I can close it, the problem is every time I attempt to do anything, it takes me back to the log in page and makes me sign in again. I have attempted to restore the database just in case, but every time I try it again sends me to the log in page and just becomes a cycle... There are no error in the error log. Open Cart version is 2.0.2.0. I have not made any changes prior to this happening.

I am getting a similar error and have been for about the last month or so. I don't know the cause or how to fix it but I can tell you a couple things I've learned to deal with it while we await a solution. First, if your problem is like mine, when you log in and get that message, the map doesn't load on the dashboard. I refresh the page, which brings me back to the login page. The second time I log in, the map loads and I don't usually get the error message. One other thing, while time consuming, is to save every page before going to another tab, even if it is in the same product. For some reason it seems the more it has to remember, the more likely it is to take you back to the login screen.

I hope that helps you deal with it, and I REALLY hope someone out there knows a solution.