I have had that happen , as there is a tree , in the front yard , and the roots get into the line. I am fighting the Cuity , to haver them dig around the roots , and I am hoping that they will do this , but it will cost me at least 2,00 for the part , that comes into the house. Grrr, I am rather angry , but they say it is mt=y tree. But I cant have it cut down , as the enviromental agency protects it.I would rather spend the money on my Cats!