Our toilet started to bubble up when we hit the pedal to flush it. What would cause this to happen? One we plunge It it seems to improve for awhile but not a long time.
Sounds like the toilet bowl has something like a pencil or pen or something like that stuck in it. What happens is the object tends to catch the toilet paper and it builds up til you plunge it freeing the paper but not the object then the cycle starts all over again. Try looking up through the the bowl with a small inspection mirror and you may be able to see whats causing you blockage.