Logged out across all devices at once...

[SadistPoet]

I was logged out across all devices on my account. Why did this happen? Is this a bug? Or is it a sign of some kind of tampering?

 

[Diana]

It's more likely your session cookies were cleared on the devices or finally after ages just timed out on their own! This can also happen if you've recently run any software cleaners on your device (like malware or antivirus) or if you recently changed your password. It can also happen if our server had any back-end changes or reboots or refreshes.

If you haven't changed your password recently, though, I would go ahead and do that just for safety's sake.