This evening I got signed out of all my google stuff. Did some searching to figure out what the deal was. And I came across this.
Account Action Required notifications and unexpected sign out issues
We’ve gotten reports about some users being signed out of their accounts unexpectedly. We’re investigating, but not to worry: there is no indication that this is connected to any phishing or account security threats.
For Chrome users seeing the error message “Sync isn’t working. Sign-in details are out of date,” please try signing in again by clicking the sign in button in Chrome.
For all other Google users, please try to sign-in again at accounts.google.com and if you cannot remember your password, please use this link (g.co/recover) to recover your password. If you use 2-Step Verification, there may have been a delay in receiving your SMS code. Please try again or use backup codes.
Chrome Community Manager