I've an issue with my N9 since the customer support repaired it for a horizontal line issue.
The screen was replaced but since the screen saver (the clock with white characters) disappears immediately and the double tap does not work. Worst when I send or when I receive a call the screen goes black and keys are disabled. Audio is ok. The screen reappears at the end of the call.
I sent the N9 back to Nokia but they returned it without changing anything. Now Nokia proposes to exchange it with a Lumia 800.
I'm worried because I have the feeling this is just a software issue. I'd appreciate if you have any idea to restore a normal behavior. I'd like to keep the Nokia N9. Resettings settings or clearing memory does not help.
I'm running PR1.2