Support Black screen/Message error

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http://androidforums.com – Hello, I am a week old user of my new Samsung galaxy note 3. Here are two different issues I am experiencing. First Text messages: I start a new message to a created contact, and will begin typing it into the window. The vibration of the phone will indicate, that I am typing, so will autocorrect, but no message will actually appear in the message box. Has happened at least half a dozen times, very annoying and I would really like to get a solution without using 3rd party apps. Second screen going black, this will happen randomly weather Im playing a game having an app open (a random one each (General)