I have 2 toilets, 1 upstairs & 1 downstairs, and utilize a municipal sewer system. A while ago the upstairs toilet needed to be plunged just about every time it had solids flushed & now the downstairs does too. Commercial unplugging stuff has been poured down both. They don't overflow, just the solid keeps floating back & sits there until we plunge excessively. The toilet paper flushes fine. Help!