Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A406 Safari/7534.48.3) This happened twice so far. My iPhone will lock up at a black screen and not respond to anything. When I hard reboot it, it'll say "no wifi" - as in it thinks the hardware isn't there. If I look up the Mac address, it just says n/a. It fixes itself after I reboot again Here's a shot of what it looks like Does this happen to anyone else? Or is there something wrong with my 4S?