Slow and Unresponsive iPod Touch
My iPod touch is really slow, and its not even half full, but it randomly quits apps a lot while they are loading and takes forever to turn on. Do I need to restore it?
iPod touch, iOS 4.2
The Basic Troubleshooting Steps are:
Restart... Reset... Restore from Backup... Restore as New...
Restart / Reset
http://support.apple.com/kb/ht1430
Backing up, Updating and Restoring