Bob Pullen confirmed that the majority of the AG gateways are gone and those left are not accepting new PPPoE sessions. So when you get disconnected that is it.
And that is how I got pushed off the AG gateways.
I've been seeing this kind of thing on and off for over a week . The answer used to be use an AG gateway but that is no longer an option. Colindale is worse than southbank and thing are worse at peak times.