I have the same thing.........
I have been afraid to diagnose this leak in the cold weather as the vacuum hoses are very brittle. Past similar incidents have proven to be either a small leak in the vacuum hose, or a failure in one of the door lock vacuum gasket/actuators. Mine exhibits similar symptoms as yours and rain, sleet, snow had nothing to do with it.
I would wait until the weather gets warm and get out the MityVac.
JCD
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