Q: iPod cracking noise !HELP!

So this weekend I went up in the mountains 1 mile up, and it's high altitude and the next morning I woke up, whenever I tapped on a certain part of my IPOD Touch 6th generation, it made this weird cracking noise every once in a while. It is not cracked or popped out at all! ITS SUPER ANNOYING! It probably is 2 screens rubbing together. Help me...