Account Action Required: There's been a change to your Google Account. For your security, sign in again
You might already have got a notification saying "Account Action Required". Well, It's not just you, Lots of people are reporting getting signed out of Google Play Services.
We have no idea what's going on, but a Google employee have replied to this issue:
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.
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.
Got Signed out of Google Play Services? Is this phishing? Or a Glitch? Discuss below and Share your thoughts
We know some of you had issues signing in today. Please try again now. Rest easy -- your account's security was not affected.— Google (@Google) February 24, 2017