TidBITS editor Glenn Fleishman explains in some depth at Ars Technica how so much Wi-Fi network congestion was in the air at the WWDC keynote. Based on discussions with two Wi-Fi experts, one of whom ran Apple's Mac networking hardware group for seven years, the iPhone 4 likely had a Wi-Fi driver bug, possibly triggered by the congestion. follow link
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Congested Wi-Fi WWDC Keynote May Have Triggered iPhone 4 Bug