yesterday after i "reset all settings", my iphone started running slow. By slow I mean, scrolling, games, menus etc, were all very jerky. Almost as if something was running in the background. I mucked around for two days, and narrowed down the problem to turning the wifi on. If I reset network settings (thus, disconnecting from the wifi network and forgetting the settings), this problem goes away, the the phone runs fine. Once I connect to the wifi network, it all goes to crap again. Whats the problem?