My iphone 4 keeps flashing black every 5-10 seconds, what is wrong with my iphone ? how can i fix it? helppppp

my iPhone 4 screen keeps Flashing black and whenever I try to tap an app it will flash 3 times.
this has been happening since last night .
whats wrong with my phone?
how can i fix it?

Hey there Antoinetter101,
It sounds like you cannot use any apps on your device without the screen flashing at you, making the phone unusable. I would start by quitting all the apps on the phone:
iOS: Force an app to close
http://support.apple.com/kb/ht5137
Double-click the Home button.
Swipe left or right until you have located the app you wish to close.
Swipe the app up to close it.
When you have done that and restart the phone and test the issue again:
iOS: Turning off and on (restarting) and resetting
http://support.apple.com/kb/ht1430
Thank you for using Apple Support Communities.
All the best,
Sterling

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