From our experience, BNG1 certainly seems to be the worst offender.
If we bring down the PPP session enough times, it will eventually connect to DSL6 (the only other gateway that supports IPv6) but it won't stay there for long.
After a few hours, DSL6 will drop the session from its end and, hey-presto, we're back on BNG1 again.
I wouldn't say that DSL6 is brilliant, but it's certainly a lot less cr@p than BNG1.
EDIT:
Having said that, DSL6 is actually running very well for a Saturday evening.
http://www.thinkbroadband.com/speedtest/button/14614...
Lizzie
Edited by bit_bucket (Sat 23-Apr-16 19:58:41)