My wife and I both updated our phones to iOS 7 last night. Her phone has been freezing for minutes at a time, won't recognize any WiFi networks, and randomly shuts down and won't restart for minutes. I know the WiFi issue is specific to her phone. My phone can recognize the 10+ networks near us, but hers just has the spinning wheel in settings. I tried doing a full restore twice, but the issue is there right away. I'm at a loss as to what the issue can be. There were absolutely no problems prior to the update.