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Sounds like you have a partially blocked vent pipe.
Have someone go up on the roof and check all open pipes sticking up through the roof for leaves, debris, birdnest, etc. and clean all out by hand that they can, and then flush down the vent pipe with a water hose sprayer. That should clear the vents and solve your problem.
If it doesn't, you may have to have the vents snaked down with a heavy-duty plumber's snake and then flushed with a water hose.
Good Luck!
Mike
Have someone go up on the roof and check all open pipes sticking up through the roof for leaves, debris, birdnest, etc. and clean all out by hand that they can, and then flush down the vent pipe with a water hose sprayer. That should clear the vents and solve your problem.
If it doesn't, you may have to have the vents snaked down with a heavy-duty plumber's snake and then flushed with a water hose.
Good Luck!
Mike