Maybe fixing the firewall issue I discovered, if so then kudos to BT and their quick work.
If it is a Homehub update I would have expected the firmware version entry to reflect that and it appears not to.
My BT Home hub 5 connection has also been going **bleep** up for the past 2 days.... I'm not sure why but it had increased it's connection from 42mbps to 48mbps.
Keep getting disconnections every couple of hours.