I moved to FTTP with A&A last September. From the start, I experienced random PPP drops/reconnects maybe 2 or 3 times per week, each time the router re-connecting within 10 to 15 seconds. I was only aware of this due to the line down/line up emails from A&A.
After eliminating all I could locally (replacing ethernet cable between ONT & router, using my backup router, trying the A&A supplied DGA0122, replacing the ONT PSU) I had a chat with A&A about it. Within 3 days they had Openreach out. The OR engineer did a light test - all good, then rang the diagnostic centre to see if they could see anything. Diagnostic centre reported visibility of 11 "dying gasps" from the ONT over a couple of months.
Advised engineer to replace ONT which he did. That was 4 weeks ago and not one drop since.
I wonder how that situation would have been handled by BT/TalkTalk/Sky etc?