Center Nav keys quit working??

[jpc0480]

Earlier today I noticed that my center nav keys quit working?? I was using the down earlier and it went nuts on me. If I pushed down, it would go forever and not stop. So I did a soft reset and down, left, right, up, and the center select quit working altogether. Did a hard reset and still nothing?? This is my 6th 6800 from Alltel. I haven't done anything to the phone, exposed it to water or dropped it. Just wanted to know if anyone else out there had a similar problem and what they did to fix it.

All my other keys work except for the center nav keys...