We have a BT HH 6a with the latest firmware from August 2019.
As we have teenegers we have a number of Access Controls to prevent Internet access during certain hours.
Recently, all devices are being restricted from shortly after the acl cease time, even though only a few are listed.
Turning off Access Control reinstates access immediatly, and turing it back on will cause all connection to fail a few minutes later again.
It used to work as expected, and no ACL changes have been made recently.
Very frustrating and now totally innefective!