Serious T8 issue

Today while running my 8E, It began to behave erratically, almost as if it was trying to slam the motor into reverse while moving forward if I got on the throttle at all. I pulled the sensor wire out, and it ran fine. I plugged the sensor wire back in and it did it again. So obviously something is wrong in the sensor wire itself or the sensing part of the ESC. It would do this even at high speeds where the ESC should be operating in sensorless mode (right?) Anyway, right now I am running sensorless until I can figure out what is going on.