Can someone help me with my iPod touch? It keeps freezing!?

I think it's generation two (don't count on it; but I'm pretty sure it's not the first generation, and it doesn't have any cameras on it). My software version is 4.3.3, and for the last two weeks, every few days, my iPod suddenly freezes, no matter what it's doing. But if it's playing music, it will continue to play music for some reason. Nothing else will work! The screen won't change and no ons will work. I can only fix it if I restore it with iTunes, but it just freezes up within a few days. Is there something wrong? What should I do?