Homing Sensor failing

I have one of my inductive sensors that has been working for months and all the sudden it will not read when it is homing (no light is flashing). The strange thing is when I back the drive screw off by hand (move the gantry away from the home position for the sensor it will flash a light. It will not flash when the gantry is trying to move home and just starts grinding.

I’ve had that happen to my MK2 and I found the wire connector at the Longboard was the problem.