I use 4 different printers which al connect via wi-fi, none of these printers will connect to the router until the router is re-booted, every time. My laptop occasionaly has the same problem. I spoke to the help desk, all they could say was that the hub is showing blue lights and the broadband side is working. I tried exlaining that it was not the WAN side that wa at fault but the LAN, this seemed to go way over the helpdesks head. Havng to re-boot the router 3 or four times day is now getting to be a pain. I spoke about replacing the hub (I have a Hub4), but he said they can't!! 2 years ago I was recommended to move to BT business, but it didn't suit so after the contract expired (in May this year) I moved back to residential, the hub I am using is the same unit that I was originally given by residential a few years ago. Has anyone else had this type of problem, and surely a replacement hub would cure it.
Try turning Smart Setup off.
Also try separating the SSIDs.