It's a lighted switch, correct? One of mine flickers...could be time to have the switch changed. Lighted switches are easy to see when it's dark. Older ones had neon bulbs in them if I understand correctly. Newer ones have LEDs. Switch bulb maybe going is all. If it is important that the switch be visible, it should be replaced. If you are handy, you can do it yourself. If you don't want to, a handyman maybe able to replace it for you.
Others who know more about these types of switches can offer more info.
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Namaste y'all
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