Robot Crashes with voltage spike

[ninjamonkey29]

Well, here it is week 4 and we are still having issues with running our robot....

Every time that we run our 4 wheels (with 4 motors, tank drive) in the required direction to turn in place to the left (left wheels back, right wheels forward) our robot crashes. The motors suddenly hit full speed, and then we can no longer control them. According to the Drivers Station, we are still enabled, and our program continues to print to the modual in wind river. The four jaguars go to their flashing orange light and will not allow control until it is re-enabled from the Driver Station or we reboot the robot. This happens both in Autonomous and Teleop. The speed of the motors does not influence whether or not it crashes. It also will sometimes happen when we move the right joystick forward or when we move the left stick backwithout moving the other, but will always happen if we do both at once. It does not happen when we turn in place to the right, only left. We have measued the output of the Jaguars. When running normally, at full speed they output 11.7-11.85v. When it crashes, it spikes to 12.05 before control is cut.

Here's what we have tried so far to find the source of the problem:
- It does this with LabView and C++, so we assume it is a hardware problem.
- Unplugging the motors from the jaguar motors doesn't make a difference.
- It will still crash when all but 1 jaguar has its pwm cable removed (We don't try all 4 as we then have no way to see if it has crashed or not).
- We have tried replacing the SideCar to no avail.

Any ideas why we are getting this crash + voltage spike?