We have a two story home. When flushed, a downstairs toilet stopped and nearly overflowed, and water backed up into a tub (also downstairs). Plunging didn’t accomplish anything. Upstairs I flushed a toilet, just as a test. It flushed fine, and the toilet and tub downstairs drained at the same time. Everything appears to be working correctly now.
We think this also happened a week ago but it is not a regular occurrence. We’ve never noticed any bubbling downstairs when things are run or flushed upstairs.
We had our sewer line snaked and camera about a month ago. It is unlikely we have roots or other blockages in the sewer line but it’s possble, I suppose.
Any thoughts on why this could happen?