We've been observing this issue over the holidays and it is now resolved.
Update · UTC
If you continue to have problems logging and get an error about an "invalid token" please delete the browser cookies for https://app.turn.ioa and https://whatsapp.turn.io and refresh
Update · UTC
We've applied some extra security policy's to Turn. If you are finding yourself unable to connect, or disconnected, you need to logout and log back in again.