Cal Reactor Issue

[Huskymaniac]

This has been happening randomly for the last couple of months and I have no idea why. My regulator is hooked up to Milwaukee controller and when the PH drops to less than 6.5 the solenoid turns off and then turns back on when the PH hits 6.6. On multiple occasions the controller signals the solenoid to turn on but nothing happens. I have to unplug the regulator to restart the co2 bubbles. At first I thought it was the regulator and solenoid. Replaced them both and it happened again. Then replaced the controller and it just happened twice. I am at a loss and the constant checking to make sure it's working is kind of getting annoying. Not to mention the concern of it happened while I am on vacation.