Claudia, if all else fails, have your cold water supply checked to see if it has a back flow arrester. If your hot water temp is set to high, the expansion will over pressure your low incoming water pressure after a lot of hot water usage. If cold water is used next, the water pressure from the hot water will flow backward into the cold water line. The water piping and closeness of the water heater can cause strange things. A water pressure regulator to the water heater can solve the problem if that is the cause. ........................bob
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