We installed a Toto Carlyle one year ago in a remodeled bathroom. It has worked well until it recently became clogged for no apparent or obvious reason. Plunging did not solve the problem. Some brownish water did back up into the bowl after several plunging/flushing attempts. A six foot snake that my husband used did nothing. A roto-rooter guy came out and said that for $250 he would remove the toilet from the floor to investigate. We said no. My child forgot and used the toilet yesterday and it flushed. We thought it had fixed itself. However, the pattern seems to be that it will flush two consecutive times, then act clogged. After several hours, it will flush again for two times, then act clogged. Any ideas of what's causing this and what can be done to fix it? I also smell a faint "sewer" smell. Thanks in advance for the reply.