This is a consequence of Zen now having their own backhaul available at the handover point for your FTTC or FTTP. When this happens, they migrate all customers from BT Wholesale's WBMC to their own backhaul (so Openreach GEA-FTTx plus Zen backhaul). Your contractual position remains unchanged. The likelihood is that your PPPoE connection will drop and re-establish automatically a few minutes later.
Well the did my circuit last night (12:15 am) for some reason unknown sync was lost and so was G.inp as a result along with 8-9mbps sync speed on the DS , on fast path profile now, but errors are racking up ,
The other issue i have is also a result of this change in backhaul is that i'm now routed via london for everything and i live in the north-west of the uk, , and have been routed via manchester since i migrated to zen over 12mths ago
I have spoken with zen support and i'm not getting anywhere so far, if they refuse to route me to manchester again i'll be looking else where