Question
So you have no connectivity to nothing? or you connect and some pages works and suddenly its not working at all?
If you have no connectivity to nothing, do you have any ACL or someting blocking to www.apple.com?
If ipad cannot see www.apple.com it will appear as he is connected he will get the ip address but he wont be able to browse...
This tipically happens when you use captive portal, and thats why i guess racking was asking you.
If you using captive portal you can cal always use a whitelist that appears on L3 authentication.
If its the second in which it works and then it doesnt work sometimes... then your problem could be the DNS... if you got 2 DNS set up let say you get DSN1 and DNS2
Apple randomly select one no matter if you put DNS1 first, and let say DNS 2 doesnt work, then if he select that DNS then it will not work and you will get that problem, and then if it used DNS 1 which is working perfectly then you will have access...