Hello, I've noticed this issues on my iPhone 5s and iPhone 5. Whenever I'm connected to Wifi it works for a little bit then when browsing websites or using apps that use Wifi it begins to stall and becomes unresponsive. What I have been doing to fix the issue is either manually shut the wifi off and turn it back on or soft reset the device. Sometimes it works, if not I have to do one of those fixes again. I just want to know if other users have this issues too or if it's my actual device. I don't think I could go into an Apple store and show them the problem especially with the device having iOS 8 Beta 3. I have reinstalled the Beta, reset my wireless router too. It all stems back to the actual iPhones. I hope other people are experiencing this too and it's just an issue in Beta 3. Thanks for the help guys.!