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Plugged vent stack or something else?

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  • Plugged vent stack or something else?

    Every once in a while when flushing "solids" (in an American standard Cadet 3) from the upstairs guest bathroom, we get a sudden "whoosh" and a bunch of noise from the drains in the tub and the downstairs powder room sink as the water is pulled from the p-trap (as evidenced by the strong foul odor of the sewer in the powder room). I am assuming that I have a restriction in my vent pipe - but that seems unlikely because there are now trees nearby that could plug it with leaves (spider webs maybe?). What I find odd is that it happens maybe once every one or two weeks. Any ideas about a possible solution?
    Thanks for your help