I have AT&T Uverse as my ISP here in San Diego, CA. I also started experiencing video buffering/lag while watching live streams around 2-3 weeks ago. This occurs with 480p or higher. Before a few weeks ago, everything was smooth sailing at 1080p.
For those posts I did not open, your issue was not specific to AT&T Uverse. Please keep this to an AT&T Uverse discussion.
Also, there is no need to provide a traceroute for viewing issues.
We’ll alert our Networking team to AT&T issues.
FYI: Traceroutes do not help troubleshoot viewer issues because we block ICMP. The only user type that can be helped by traceroutes are broadcasters.