Touch screen not responding?

I have a week 38 iPod Touch and it was working perfectly up until the update last week. After that I started having problems with my touch screen not responding to anything for periods at a time. I don't think the iPod is frozen because I can still lock it and even slide to unlock it, and I can double press the home button the make music controls pop-up but I can't actually control anything in it.

I was wondering if anyone else was having this problem and if you guys have any suggestions on what to do? I plan on taking it to a Mac Genius in a few days to see if I can show them the problem.