I have had my GS4 for about one month now. It was purchased new and loaded with KitKat 4.2. I upgraded to 4.4.4 shortly after getting the phone. Recently, I've found that random app icons will occasionally be missing after booting the phone (the problem is inconsistent). The icons will be missing from both the app drawer and home screens simultaneously. Usually, only one will be missing while all others are visible. Further, it's only the actual icon that's missing. The app label below where the icon was is still visible, and the app can still be launched. While I have disabled several apps, the ones involved have not been. Typically, a reboot will resolve this and the affected icon will then be visible. For reference, all apps are installed on the phone storage and not the SD card (16 Gb Sandisk Ultra), and I do not use any type of an app killer. Anyone have any ideas as to what's going on?