What causes a light to turn itself off/on?

So the house I live in is pretty old and I noticed the other day that one of the bulbs in the fixture in the living room had gone out I thought I just needed to replace it but a couple of days later it just started working again.. Could this be a wiring problem? Or possibly just a bad bulb? It only happened the... show more So the house I live in is pretty old and I noticed the other day that one of the bulbs in the fixture in the living room had gone out I thought I just needed to replace it but a couple of days later it just started working again.. Could this be a wiring problem? Or possibly just a bad bulb? It only happened the one time but now im afraid to use the light I don't want it to cause an electrical fire.
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