Lock screen will not sleep

[Xalyx]

I have an odd issue where when I get a notification or wake my phone to the lock screen but not unlock it, the lock screen will never timeout. The lock screen just stays on until I manually sleep the screen again. This happens 9/10 times. If I wake the phone upright, the screen will go back to sleep in the normal 10 seconds. Also if I wake the phone while it's flat on a table, then lift the phone, it will dim, then go to sleep as usual. I tried a factory reset without restoring from a backup and it's still going on. Anyone have ideas? It's killing my battery and it hardly makes it through a day.