Water backing up in house for 3rd time
My family and I have lived in a two story, 2 bathroom house for over a year. We have had no problems for most of that time. Then, about 2 months ago, some strange things started happening concerning appliances that use water. The toilet started bubbling when the washing machine would drain, the tub drain was very slow and there was a BAD smell coming from the laundry room closet. This was apparently a half bath before we moved in, but was converted to a closet. So a month ago, while the rinse water was draining from the washing machine, water overflowed from the old toilet hole(it is covered with wood)in the laundry closet, sewage backed up into the tub and the toilet in that bathroom overflowed. I called a plumber, and he checked the main line and said it was clogged with "black gunk". He used a tool to clear it and wrote on the receipt that everything was working great and he saw no other problems. Two weeks later, same things happened. Called plumber again, he came back and said that he had only cleared the line from the house to a "sharp bend" in the pipe in the middle of my yard. He told me he cleared this time from the sharp bend to the road. He also said that this would keep happening(he did not say that the first time) and that he would have to charge if I called him back out. He said the sharp bend will make it impossible to keep clear. We lived here a year and only had problems recently! Is it true that this will continue? Is there more that he should be doing? What do I need to be doing or asking him?