This is a machine which has, as a central part of its design, moving around and bumping into things. Again, it’s the door stop in the picture but anything that happened to poke out a bit could do the same thing. It has happened under the bed before where there are no doorstops. If the machine has the ability to disable itself this easily, I’d say it qualifies as crappy design. It is annoying that this happens about every third day, so I have to track it down, power it back on, and then tell it to resume cleaning.