I have the exact same problem only on my iPad 3rd gen. I literally have done everything that i know; setting router, disabling genius, restoring iPad software, disabling Qos. I mean i have done everything short of taking my device to an apple store. The only reason i can assume it is the update is because for one it was not like this before the update, and that other devices on my network have flawless connectivity i. The sense of streaming of video, and downloading of software. And with my iPad its spotty at best.