I often have lamp bulbs in my home that unscrew themselves. No reason for them to do so. No pressure on the bulb from any means. Eventually, the bulb will stop working and instead of the bulb being blown, it has loosened in the socket. Since switching to CFL, or LED, this is not happening. I think it's that the bulbs are not rotating at the same speed as the earth is, therefore they loosen over time. (JK
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