I examined the water intake in the back and found no issues. After some research, the suggestion was to replace the switch, due to corrosion. The unit was only two years old, but I ordered the part. The most challenging part was taking apart the front panel. I broke one of the clips, but the YouTube videos said this would be expected. After uncoupling the wires from the panel to the main unit, I decided to test before replacing the switch. After pushing the switch from the inside a few times, the pump that dispenses the water in the main unit stopped humming. I examined the part and everything appeared to be in order. Decided to not replace the switch and reassemble the unit. Everything has been fine for the past four days, but still keeping the bucket on the floor in case the unit decides to start randomly dispensing water again.