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My name is ***** ***** I am a professional here at Just Answer. I noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
My info is limited on your model here but I see no one else has responded and thought I would see if I can help here.
This type of fault here can be caused by a plugged drain or vent/inlet air intake for the toilet system.I would have this checked into further to locate which is the cause here needing repaired then repaired from there.