I have problem with screen time out. My screen just doesn't want to turn off after a period of inactivity, It stays on making me manually turn it off (and this is annoying in the middle of the night) I have even check my screen timeout setting and I have it at the lowest, but it passes. That time and still doesn't turn off.
If it's not screen timeout settings then did u play around in developer mode with screen timeout? If not then maybe just restart ur phone with the 30 sec screen timeout or whatever u want.