Just wondering, does anyone else have problems with their 920 constantly hanging up on them during phone calls? I'm assuming this is a screen sensitivity problem, as in having the side of your face/cheek touching the screen as it also sometimes switches over to speakerphone, so I'm guessing my face touched the screen buttons. I've been making a concerted effort NOT to touch the screen with my face, yet keep getting hang ups....today in particular, has been a bad hang up day. Is this common?