Talon SRX magnetic encoder issues

[cjl2625]

I've been having a strange issue with the SRX mag encoders, sometimes leading to rather catastrophic results.

Running them in absolute mode, I've seen an issue where the reading seems to unexpectedly jump. For example, we're driving around the robot, and then one of the encoder readings suddenly jumps from 0.8 to 1.8 (measured in rotations). So it jumps up by exactly 360 degrees, and then the motor tries to unwind the extra full rotation. And when this happens, things rotate too far, wires get ripped out, and all sorts of Bad Things™ ensue.

I was never able to reproduce the issue in the pits, so perhaps it was an issue that arose with the robot getting beaten around on the field.

Does anyone have any ideas as to what could be causing this odd behavior?