I've had two Z30's and on both of them I've had a problem with the screen rotation. Specifically, when I'm in portrait and switch to horizontal to review my email, it frequently won't revert back to portrait. Is there a way to turn it or shake it that will make it go back to portrait view?....this happens about half the time. Sometimes I have to do a hard reset to fix it, but then it reoccurs. Any fixes? Btw, I'm using OS 10.2.1.2180....thanks!