I have Infinity 2 and have the Home Hub 3 plus the white Openreach modem and once in a while my wi-fi seems to jam yet the Home Hub 3 lights stay blue.
Sometimes turning wi-fi off and on on my IPad mini or IPhone 5s sometimes works but other times i have to reset the Home Hub.
Its only started doing this in the lasst month or two.
My sister popped in the other night and for a few seconds her w-fi on her Iphone 6 stopped using my router.
Any Ideas what could be cousing this.
All seems to be working fine on my laptop via ethernet cable and BT TV with the Youview box works fine.
Reset the home hub 3 to factory default, that will clear the stored list of devices, which never seems to clear on its own, causing connectivity isues after a while.
I reset the Home Hub 3 back to factory settings the other week like you said and that did help but in the past few days the problem with wi-if seems to be slowly starting to come back but so far it don't seem as bad as it was before I reset the Home Hub 3 back to factory settings.