happened to me once - i expect that phenomenon to disappear, within the next ios bugfixes and when all apps are updated. i've also had some apps that worked perfectly fine on my old ipad 1 (not air) crash on startup.
- safari sometimes does not respond when i click (touch ?) a link on a freshly loaded page until i make a pinch zoom or something else. (sometimes it seems, that it's loading the linked site in the background, but it gives me no indication that he link was activated.
- and third: what's with all the graphic hiccups? - it got double the ram and a much faster gpu/cpu combo, but sometimes still hangs for fractions of a second in graphic intense games like asphalt 2, real racing, infinity blade or zen garden. as these games were made for the air 1, i can only assume that's because of some developer's tricks to get around the 1gb ram limit. (maybe the games are that optimized that they don't benefit from the added ram yet). i hope it's not a bottleneck somewhere in the hardware.