Well, it feels like the accerelometer on my N9 gets 'stuck' occasionally. For example, using the Level Touch app, the bubbles don't move always when I tilt the device. When I shake the device a little bit, the bubble positions update. It also happens sometimes when tilting to portrait/landscape, I need to shake the device to get it to change. Anyone else noticed something like this?

I also have an exactly the same problem like you.My friend told me to go to nokia centre bcoz maybe of hardware problem,or you have the solution