I too have been experiencing what appear to be the same issues on the 128GB iPad air w/at&t.
*After a while, seemingly more than a day or two, Internet request over existing wifi connection no longer returns requests/data*. Ie, web browser times out and informs me the pages are not available.
Am not experiencing issues over wifi with sem-perma-connected Linux laptop, android phone, iPhone 5.
Nor was I experiencing issues with previous iPad 3 32GB w/at&t for 18 months on same router & internet with no issues.
I *believe* I was not experiencing with iPad air 64Gb w/at&t, but had that less than 2 weeks before exchanging for 128GB, so that led me to believe it was this very specific 128gb iPad, and not all iPads in general.
Easiest way for my to work around the problem is to reconnect with the network. Either turn off wifi and turn it back on, or to choose a different wifi SSID and return to mine - I have 2 available. Based on another person's comments in this thread leads me to think it could be related to not renewing the dhcp lease. I know my router is set with a longer lease than normal, so if that were the culprit, I would experience this issue much less than other people, for it would take longer for the lease to expire and cancel the subscription. For reference, lease time here is set for 4 days. I feel like I lose connectivity maybe 1x a week.
I shall start tracking which days I get dropped, and note if or not I use someone else's wifi in the meantime.
If anyone who loses their connection multiple times a day could perhaps check on their lease times and see if it's short, say an hour or 3, so we could compare notes?
Thank-you!!
Since to many are experiencing the same issue, I doubt it's an issue with my own personal iPad. That's what I wanted to know, for I half-expected to return it. Apparently not.