I have exactly same issue here, anytime I turn ON access control with some listed devices, it automatically turned off some of my computer that are not in the list. This is really annoying as my Mrs is complaning everytime that after 9pm she can't use the computer. The access contro is set to go off for certain computer and tablets for kids after 9pm but seems to be aftecting other computer.
I have tried to reset the router, powered off/ON to see if this can resolve this issue but NO
The only option to get pass this problem is to turn off the access control
This does not address my issue in any way. I setup BT access control from my router (BT Home Hub Manager) and not via bt.com/My BT etc. Enabled access control, select devices and set time to go ON and OFF.
My question is why is it affecting unselected devices. I simply want to set some devices in my LAN to have access to the internet at certain time via Home Hub.
If I use your option, this will directly apply to all devices