Why does my screen darken at random moments? Im unable to see my screen, I cant even unlock it to check on apps

I just received the iphone 4s but at random moments the screen darkens and I am unable to see anything. Im not even sure my phone is on unless I completely turn it off and on again but when I turn it back on the screen is dark. I cant unlock my phone adjust the brightness or anything not that matters because my brightness is all the way up. Please Help

Have you tried reset?
Restore?
Page 46 of the manual:
"If something isn’t working right, restarting, force quitting an application, or resetting
iPhone will likely solve the problem.
Restart iPhone: Press and hold the Sleep/Wake button until the red slider appears.
Slide your ﬁnger across the slider to turn oﬀ iPhone. To turn iPhone back on, press and
hold the Sleep/Wake until the Apple logo appears.
If you can’t turn oﬀ iPhone or if the problem continues, you may need to reset. A reset
should be done only if turning iPhone oﬀ and on doesn’t resolve the problem.
Force quit an application: Press and hold the Sleep/Wake button on top of iPhone
for a few seconds until a red slider appears, and then press and hold the Home button
until the application quits.
Reset iPhone: Press and hold the Sleep/Wake button and the Home button at the
same time for at least ten seconds, until the Apple logo appears.
For more troubleshooting suggestions, see Appendix A, “Troubleshooting,” on "
http://manuals.info.apple.com/enUS/iPhone_UserGuide.pdf

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