We had a similar issue at South Florida last year.
Video:
http://youtu.be/-10NzmkJaaE?t=2m10s
The encoder on the wheel broke during the match and sent the wheel to full speed, where it stayed for a good portion of the match. Eventually, it was too much for the tread to handle and it partially came off the wheel. The flap of tread then came around the wheel and obliterated our camera.