I thought I was having the same issues with the lock screen but it turns out that it was the way I was unlocking the phone. I think that you guys might be experiencing the same issues. Anyways before the update you were able to just run your fingers anywhere in the screen and that would allow you to unlock the screen. Now after the update you really hav to use the grey bar. If you place your finger on the gray bar and swipe down on it the phone will always unlocked properly. Try that and let us know. Here is a video showing you what I mean.