Have owned our Litter-robot for many years now, have had to make a couple adjustments and repairs but overall have been very satisfied. Today experienced a new issue, after hundreds of box empties it seems the sensor foot wires take a pounding that sit under the rubber cover, today one of the wires broke off, symptom was yellow light for a minute then to red stayed on. Solution was to get out my little soldering iron and reinstall the wire. Works like new again, just need to remember to be a little more gentle inserting the tray “(collection box”. We’ve added two new kittens to the family so in need of another box, ordering as soon as our budget allows. BTW – Litter-robot service has always been very helpful with trouble shooting and sending replacement parts as needed.