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Our robot just did the circle dance ...
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I assisted a team in Lubbock after a similar issue. It happened at the end of Th and we didn't find it. It happened again on Fri and we saw that most of the motor controller weren't receiving a signal when code was enabled. We discovered that the ribbon cable was no longer zip tied down. It was lifted on one side, so some connections were present, some weren't.
I've also seen this when a limit jumper "fell off" of a jaguar. Without the jumper, the motor will not run in one direction.
If you haven't done it already, check the basics, verify both the code, the electrical, and the mechanical. Could a bad sensor value cause this? Gyro's are finicky if not calibrated when the robot is stationary.
I'll be happy to help interpret the log file if you want to PM me.
Greg McKaskle