http://youtu.be/HH_CG-Jmpr8?t=1m
I think that might have happened in QF1-2 at Milwaukee. It looks like all the robots stop at once, and then we(1675; big yellow PVC forks pointing up) ram our alliance partner. Same code, stopped in match 1, not in 2. This behavior didn't make sense at all to me, or anyone on our team at the time, but this field issue might explain it. Perhaps it screwed up our Timer or something.