smoke alarm

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Usual culprit is airborne grease particles from cooking, mixed with dust in the air, resulting in a coating that clogs the sensor brick giving a false signal. Try replacing the one closest to kitchen first. If interested, stop by a fire extinguisher maintenence dealer and purchase a can of "smoke". It is a non toxic chemical substitute for testing smoke detectors without leaving a residue on the sensor as normal smoke does. I used this stuff on inspection of fire detection systems, whether a "small" home, or huge warehouse where the detectors are in the air circulation system.

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