Screen dims but will not go into lock a lot of the time

[evereddie]

For some reason lately my phone is found with the screen dimmed but not totally dark and not in lock mode. Thought I read of someone else with this but can't find it. Any thoughts?

Update, it looks like if i put the screen in lock using the power button it will stay in lock, but if i let it go to sleep on it's own it dims but does not go out and does not go into lock.