We've had the ARP device since 2015, after having the cooling unit replaced the second time in less than a year. With the ARP device, now called Fridge Defend, we are still on the same cooling unit and it still is working great. We have the unit that has two cooling fans in addition to the factory installed fans.
https://www.arprv.com/
The water hose port has a built-in check valve and it has either failed or has some debris that is causing it to stay open, allowing water to exit instead of keeping water inside the plumbing of the rig.