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There is oil stained on the bulb, blocking the light.
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The wattage is not enough, it's time to change the bulb, or maybe the voltage is low.
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Check with the property management company or an experienced electrician, eliminate the cause of the fault as soon as possible, and restore the wiring and lighting to normal!
Cooking, of course, there is a noise, if there is no one, it may be a cat or a dog, or a mouse stealing food.
If the contact is not good, or it is about to break.
It's not expired, it's just absorbent, so it's recommended to store it in a dry environment as much as possible, or use a bottle or jar for storage.
Check whether the gas switches are turned off properly, and if they are not turned off quickly, if they are turned off and there is still a smell of charcoal burning, contact the gas company for door-to-door testing.
There is still a current after turning off the light, it should be a trace induced current, the problem of the switch, just change the switch, try not to use the switch with the function of the night light, thank you.