Every now and then when I go to unlock my phone, the slide to unlock won't slide all the way, it will go about a quarter of the way and go back. My hands aren't slippery or anything and my screen seems fine when I look at it. I eventually just wipe my screen over several times with my tie(since I'm at work when it usually happens) and I'm able to unlock it. I wasn't sure if anyone else had this strange problem or if it was just me.