Black screen during calling with the lumia 930

I just received the lumia 930 a few days ago. Perfect device however every time I want to make a call the screen goes black. I had a lumia 920 without this problem. Is there a solution? (without blowing the dust, restoring to factory settings or bringing the device back to the store?). This is such a devastating problem as it is almost impossible to just answer the phone. A have no protective cover etc.

Eath4306, so difficult to say.
I saw that if I use a cloth to clean (or simulate cleaning the display on top of the sensor) and bright light then it comes back for a few seconds... enough to be able to end the call. Not able in any way to dial keys as for example to join a conference call.
I also checked to see if is possible to make an application to disable the sensor... However, so far I couldn't see such option. Every application will ask OS to provide access to devices, and no other app can interfere there. Although I have plan to just build an app to test all phone sensors.
This proximity sensor seems very sensitive. It could be calibration issue, which then should be fixed by firmware. But Microsoft should consider this and at least allow the possibility to disable in the Phone app the proximity feature. I could live very well without it. In the past I was just pressing the power button and screen will go off.
So, Microsoft/Nokia, here are people that believe in you! Do not disappoint us!
Gia
PS
I have anyway in plan whenever available this week to go to shop and ask for replacement. This time I know what I have to test when i buy it...

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Please re-post if you require additional support. Thank you for posting on the HP Forums. Have a great day!
Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
Dunidar
I work on behalf of HP
Find out a bit more about me by checking out my profile!
"Customers don’t expect you to be perfect. They do expect you to fix things when they go wrong." ~ Donald Porter

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