I had this happen twice today. I've never had a problem before. For me I would use the phone just fine, then let it sit and the screen would lock/turn off. When I unlock the screen I see the wallpaper and can navigate from home screen to home screen just fine. I can also open the app tray and see all apps, and access the settings menu. However, the homescreen icons are ALL gone. I power the phone down and back on, and they're back. Let the phone sit, unlock the screen and they're gone again. This time I powered down, pulled the battery, and turned the phone back on. So far so good, but we'll see with time. I also noticed the icon for the SD card showing up for no reason today, so I don't know if that's related. The only recent apps I installed are: Shop Savvy and Tricorder and updates to Draw and Iheartradio. I don't know if it's related or not, but I also noticed that a bunch of apps running at startup than normal. It used to be when I'd turn the phone on and check ATK there'd be the google stuff, and a few apps running. Now a ton of things, that have been installed forever and never would start when I turned the phone on, are all running.