Lock screen doesn't always lock since update

[pants116]

So, since the new update on 22 Aug, my phone can't decide when to lock or use that new slide unlock that doesn't require any form of password. It is set for the screen to dim out after 2min, but lock after 5. It worked fine before the update so that if I turned the screen off only to turn it back on a few seconds later, I'd just have to slide it unlocked. Now, everytime I hit the power button, it requires my password, but randomly (like just now where I left my phone in my room for about 45 minutes) I turn on the screen and it just asks me to slide to unlock. Basically, if someone takes my phone, it will decide to let them in on one of their attempts....very useful...is it one of my settings? Has anyone else had this happen?

Thanks,
Pants