My N9 acts like it receives random screen presses and swipes even when my fingers are nowhere near it.

I've been putting up with it for a while but it is happening more and more often and the phone is becoming unusable. I keep my phone in a leather case and there is no obvious sign of damage.

I've tried cleaning the screen with a dry tissue but it had no noticeable effect. Anyone seen similar symptoms? Even better, has anyone fixed it somehow?

Failing better ideas, I think I'm going to have to return my device to Nokia for replacement (it's still under guarantee).