Weird #plumbing issue. In warm weather, our toilet and drains sound hollow, gurgles, etc, when flushing or draining, like when the tub is drained. In the cold months, it is fine. Last year we had the system snaked 100%. No clogs–been an issue since we bought house in 2019.
I am thinking the warm weather, wind, etc is causing negative air pressure through the main roof plumbing vent
