Status bar keeps disappearing

[mikey2003]

I just upgraded my phone from an iPhone to an Android s4 Samsung and it worked great for the first day but now my top status bar will disappear and my phone will freeze up until I hit the back button then it allows me to use the phone as normal but it will disappear again and it will keep doing this and when it does this I can not play any games because it keeps stopping the game in fact it has done it 3 times with just me trying to write this can someone please help me out it is very frustrating thinking of going back to the iPhone