Despite having around a 35mb connection my iphone and my brothers will only connect at 10mb - is this a known issue?
I've turned off smart connect.
Have you split the 2.4Ghz and 5Ghz networks?
Try separating the SSIDs and renaming them.
http://bt.custhelp.com/app/answers/detail/a_id/447
I have merged your two threads as they are asking the same question.