I have a relatively new house (>2 yrs) with a head-scratcher. When I run water continuously at one side of the dual vanity for more than a couple of minutes, I hear a "popping" sound behind the mirror and - it seems - overhead. It starts slowly and frequency of pops increases to about every 3 seconds or so. It seems to be worse during colder weather. It is a second floor bath with attic/mechanicals directly above.
It is only the one side; also have a shower, garden tub, and toilet in this bathroom with no funny sounds. It also happens with hot or cold water. A friend suggested the drain vent, but not an actual problem or solution. Thanks for any help.
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