Has anyone else experienced brief problems with the accelerometer functioning properly (i.e. switching from portrait<-->landscape)? A day or so after I first got the iPhone, I had an instance where I'd have to really put some force behind the movement from portrait to landscape in order for it to register. Other than that one time, it's worked fine ever since--until today. As I was leaving work, I was trying to use the Cover Flow browser. I flipped the phone sideways, and I couldn't get Cover Flow to pop up. So I backed out of iPod mode, and went to some pics and tried to rotate the phone. The pics weren't rotating either. As a last ditch effort, I went to Safari, but it wouldn't rotate either. I figured maybe a reset might work, so I turned the phone off, then back on, and tried it all again. Still not working. However, I did notice that if I would rotate the phone, then tap the back of the phone, it would finally register. By this time, I was almost to my car, so I quit playing around with, but left the music playing. Now that I'm home and playing with it once again, it's as if nothing ever happened. It's working beautifully again. Anyone have anything similar to this happen to them? Any other accelerometer "wonkiness" to speak of?