I dropped my iPod and of course the screen cracked, now afterwards it still worked just fine. But for the past couple of days it doesn't respond to when I touch certain things, or it opens something else that I didn't press. Some letters on the keyboard aren't working either, I have to either lock it then unlock it to make it work. Also now I can't turn it off...should I just replace the screen and hope for the best or just go ahead and get a new iPod?