OK, so, whatever was going on sorted its self out… after I reset my google account password.
So, I got an alert from google in the middle of the “problem” saying suspicious activity was detected from a device logged into my account. My server. Reset the password and all of a sudden Plex worked, Minecraft and Satisfactory game servers started working online again.
I just done malwarebytes scan and its clean.
I wonder what on earth was going on!