Iphone4 screen goes dark while I'm using voicemail

or calling...I suppose it's to save battery but I looked at settings and didn't find anything to adjust it - For instance, I want to place a call to my voicemail on home land line, I do so and then hit the speaker to hear it without holding the phone, the voicemail needs to have some numbers put in but about half way thru the screen goes black - the voice is going on about needing to punch in 1 1 # and I'd do that if I could see the screen= but it's black = if I punch around it comes on again but that defeats the purpose of having the keypad nonhidden = and i end up punching the wrong number anyway [hitting 5 to get the screen back on because I can't see the numbers of course]

My new Macbook Air (Core i5 - mid 2011) Build 11A2063 doesn't have the same problem where the screen goes black while working, but I DO have the major issue of it not waking properly after sleep.
Mainly with the lid open on battery after leaving it for 20 mins, I come back and the thing won't wake. It just sits on a black screen. I'll have to either shut the computer down by holding the power button or close the lid and wait 5 to 10 seconds and then open it back up and THEN the login screen will come on.
I think this is a hardware issue. How would we report this?
And does anyone else have this problem?

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