I would go outside and check the point where the power lines come into your house. It's a slim chance, but my mom's house was having the same problem awhile back. It was caused by the support that kept the wire tight pulling out from the house. So instead of a large run of cable from the power pole to the house being supported by steel eye-bolts the main circuit-breaker outside was taking the weight of the wire.
This would cause the house to lose power for a few seconds everytime the wind blew the line around. Needless to say, this was not only inconveinent but also very dangerous.
In any case a call to the power company wouldn't hurt at all.
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"Empirically observed covariation is a necessary but not sufficient condition for causality" - Edward Tufte
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