Screen black while talking

[pinkpig]

When I'm talking on the phone I notice my screen turns off fairly quickly and that I have to hit my power button to turn the screen on.

Now I've poked around the phone and can't seem to find anything but all I'm asking is it lasts a few seconds longer than it does.

When your on the phone to a company that consists of "Press 1 if you want this, Press 2 if you want this"

and you go to press the number .. and the screen is off.

Any way to make the screen not go black longer?