Thumbwheel not working?

The thumbwheel on my Sansa Fuze does not seem to be working.  I bought it brand-new a few months ago and it worked fine… then I packed it up when we moved back in December.  I finally unpacked it last month, and it still worked fine.  However, my 10-year-old son snuck into my room and stole it TWICE :angry: and now the thumbwheel does not respond!  I can get to the menu, but when I turn the thumbwheel, nothing at all happens… it is stuck on FM radio.  From the menu I can press on the right-hand size of the thumbwheel and go back to the FM radio, but that’s about it.

Is there any way to fix it?  Am I just out of luck?  I think my son owes me a new one… the first time he took it I got it back and hid it from him, and he snooped around until he found it again!  (Grrr!)