I have been successfully running a Min-max control ATO setup in which the low level sensor (sensor 2) turns on a solenoid connected to my ATO reservoir and fills the sump until the high level sensor (sensor 1) is triggered. The problem is that every few days I get an alarm, alarm: LevC. 1, which I can only disable by unplugging and replugging the sensor 1 plug. Sensor 1 is my high level sensor, plugged in to the sensor 3-4 port on my Profilux 4 and sensor 2 is my low level sensor, plugged in to the sensor 1-2 port. Profilux firmware is up to date. Why is this happening?