Top 10 summary page timing out after 10 min

I've got a strange problem that has cropped up a week after the NPM 11.0.1 upgrade.  I am logged in with an admin account that has Session Time Out disabled.  About 20 min after login, the Current Top 10 summary page will start showing error messages on multiple resources saying:  There was an error while rendering resource with id xxxx.  Each resource has a different ID number.  When I refresh the page, I find I am logged out