Pizza they also get hard to turn when the controller breaks loose and raises up enough to cause the thumbwheel to rub against the case. I had mine do that a couple times.
Yep, what 5'er said can also happen. I had a pcb come unglued to it's little rim under it because I had a bad habit of just turning it upside down and plopping the batteries in. That's the pcb they are butting up against...so now I'm gentle when I change my batts.
Try the tapping in the picture post and see if that helps. If it seats the dial and frees up the wheel, roll it back and forth a bunch of times to clean out any debris that might be in it.
If you end up needing the whole pcb re glued just holler and I'll hook you up with the RMA form and where your son can pay for it It's a simple repair for $10.95+shipping.
Thanks my friends!!! (and two of the most helpful, friendly people on ECF... Of which there are a LOT of!!)
I'll check it out tonight. I did try doing some poking and pushing, but not much as I didn't want to cause more damage. Seeing the pics will help.
And.... Just in case I can't fix it, don't none of you all go and tell my son how cheap it is to repair!!!