Hello,
I want to tell you something, the quality built of Nokia N9 is not as good as Nokia N900. Considering buttons dissolve inside on the long run. I had all NOKIA devices and never faced anything like this. Only Nokia N9 the power button just dissolved and won't press.

Good Device, Bad Quality.

Just give your device a nice R I P like I did.

That's why I prefer Nokia N900 more.