FWIW, 2 comments:
1. Are you on slab? We had an issue at a prior house, which was actually in our basement (on slab) because the builder drove a piece of rebar, which had been driven into the gravel before pouring the concrete as guides for leveling the concrete, and had punctured the PVC drain pipe. Ended up being a catch for paper debris that would sometime clog, and sometimes clear itself. Builder eventually ran a camera into the pipe to find it. They had to bust through the concrete slab and replace that section of pipe.
2. Our current house has a long 75 run from the front bathrooms, and the pitch is minimal. We had clogging problems after being on vacation, which we finally figured out was paper, etc. that had dried and stuck in the pipe. After getting home, using the toilets and W&D would dampen and dislodge some debris, which was getting stuck in the 90 bend at the end of the run. We had the plumber run the snake a couple of times, but twice it cleared on its own. I eventually I started pouring a drain cleaner (
https://www.homedepot.com/p/Instant-...1801/100126446) about once a month, and the day we get back from vacation, along with a couple of sink fulls of hot water. Since I started this periodic treatment, I haven't had any clogs.