If there's no message its probably a sensor malfunctioning. It might be a cliff sensor, the bump switch, or wheel-drop (left, right, or caster). Try cleaning the sensors and vacuuming things out as a first step.
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If there's no message its probably a sensor malfunctioning. It might be a cliff sensor, the bump switch, or wheel-drop (left, right, or caster). Try cleaning the sensors and vacuuming things out as a first step.