Metal Gear Solid: Peace Walker

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Hi im kindda new here. In fact this is my first post here. So yea. I have a Nexus 5 and clocked to 2.3 ghz CPU when I play Metal Gear Solid Peace Walker after you rescue Chico he tells you that the trains are being used export weapons across so when you go to investigate to get the train station the game freezes you're still there but it freezes it doesn't go further. Any ideas