This is my 2nd unit, the other was returned for the same issue. For some odd reason the pump just keeps pouring soap without anyone being around it, and overnight, all by itself. I called the help desk, (even out of the box, with no usage) they said: To clean the sensor, turn the unit off, take the batteries out, and then restart the unit... which we followed it to the letter, and yet it keeps on pouring out, (much less than before) however it's annoying to see it not working as it should. We have the other, the non battery, and from day one it works flawlessly. Pls advise!! Thx!