Default [Q] Phone does not sleep after Reboot?

hello, I've been trying to find out what causes this... but I've pretty much hit a dead end.

on occasional reboots, the phone reaches the homescreen and does NOT sleep.
it will stay there until I open any app
at that point
- it will vibrate
- activate wifi
- activate power-savings
- activate color setting (Professional Photo)

when the phone reboots properly (and sleeps after reaching the homescreen)
it will automatically
- vibrate
- activate wifi (I reboot with WiFi ON)
- activate power-savings
- activate color settings (Professional Photo)

hope someone can chime in on this