Let it "cool down" nad then try the follow and see if the problem reccurs after eat action:
- Reset. Nothing will be lost.
Reset iPod touch: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
- Restore from backup
- Restore to factory defaults/new iPod. If you still have the problem and you likely hava a hardware problem abd an appointment at the Genius Bar of an Apple store is in order.