Lumia 800 constant blank screen during calls

hi guys,
I have a nokia lumia 800,
when im on a call the screen stays blank so i cant access any of the in call options? i dont have a screen protector on the phone, i have run the diagnostics app and the the proximity sensor is responding fine!!! so it leads me to think its a software issue? is this a common problem or am i doing something wrong?
hope you can help.
daniel

The screen gets turned off during a phone call when the proximity sensor is covered. This is done to avoid accidental touch screen actions when you are in a call.
If the screen gets turned off immediately when dialing a number or receiving a call, check that your phone does not have any object which may cause detection. There are various non-Nokia original screen protectors sold in the market which cover the proximity sensor causing blank screen issues during calls.
You can take the following steps to check the issue. If the screen keeps turned off, the protector may not be of the right size and will block the sensor on the upper part of the front side. Then either remove the protector or cut off the plastic from the blocking area.
Make or receive a call with the phone.
Once the phone is in a call place your hand 1cm above the screen and display will turn off.
Remove your hand and display shall turn back on.
Repeat the test steps 1,2,3 for 3 times to verify the proximity sensor function.
If i have helped at all a click on the white star below would be nice thanks.
Now using the Lumia 1520

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Lumia 800 constant blank screen during calls

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