Nokia Lumia :: 920 Screen Will No Longer Rotate?

I've had my Lumia 920 for about a month now - it is a German Vodafone model. As of today while I was out at work I went to use it to send a text and they keyboard would no longer change orientation when I flipped the phone sideways. Nothing would rotate anymore, photos, web pages; its as if the rotation setting is not working. I looked to find one but I can't. I've heard a few issues on various forums like WPcentral about this and that it might be a software bug, and a search of this forum has another user whose rotation doesn't work, but I don't know why this would have just started, and I've tried hard resets and soft resets and nothing seems to fix it.I would really like some information about this or a possible fix, as this is really killing the useability of the phone - that along with the random restarts which happen several times a day on average.