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Help Jelly bean software

Hello everyone, recently today i upgraded my Galaxy S3 to the jelly bean software, and now when i watch movies on the internet, after about a minute the screen goes dark and goes to the lock screen. It works fine with youtube. Before i upgraded it was all fine, i watched movies on the internet and the screen did not go black. Does anyone know the reason, please help.
Thank You!!!! please help me, it was not like that with the previous software, Ice Cream Sandwich. or is there a way i can switch back to the old one?
 
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