If the lights controlled by your movable switch are exhibiting unpredictable behavior, then it’s likely that you need to replace the batteries. If you notice the switch is behaving sporadically, your lights are not staying off, or not dimming properly, then these are all good indications that the battery life of the switch is low. You will typically start to notice odd behavior of the switch when its battery life is between 30-50%.
You can check the battery life/learn more about replacing switch batteries by following THESE STEPS.
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