This EXACT same issue has been happening to me, and I have tried the same options of repair that you describe. I tried repairing the game files, disabling all other network adapters i was using (which were all not connected besides LAN anyways....), I reinstalled the game, tried wifi instead of LAN, changed router settings for NAT type, checked that all ports are open (every single port is open for titanfall 2).
I have only been able to connect ONE time to a server in Sydney (Sydney GCE 1) which was the only one that allowed me to connect. I am on PC btw.
