Some one with your Plex access credentials has removed all your Friends from your account very few hours ago.
So that may be anyone
- who as access to devices which are logged into your plex account
- who has successfully found out your plex password by guessing it
- someone who found out your password by looking up your email address on other compromised services.
I urge you to reset your Plex password ASAP and re-link the Google and Roku accounts. You still haven’t done the pw reset after this incident: Important notice of a potential data breach 24th of August 2022
If you had stored your passwords on LastPass, consider them exposed now. LastPass admits attackers copied password vaults • The Register
