Sorry to hear about you sanitary sewer issues. They are the worst. Never had much issues myself until I moved in with my wife. Before then I lived in mostly newer and pretty well maintained apartment buildings.

Since then it is always something. Every few years. Squirrel dropping a walnut in our stack. Roots in house main line. Long term buildup in various lines that need to be cleared. One bathroom toilet just not flushing that well... I think by design. Now a stinky sink drain.

I sometimes wonder if all this low flow stuff makes things worse.