My house is on a slab foundation and is connected to the city sewer system. My problem is that on one side of the house the plumbing that connects to the master bathroom and my washing machine is backing up into my bathtub and out of the toilet. I have had a plumber come out on 3 seperate occasions and rod out the lines and do the roto rooter through all the lines and the cleanout line outside the house. This seems to fix the problem for about a week or so then once again it backs up into the house especially when washing clothes or taking a shower. Should i get someone to come out with a camera and check for anything or does it just sound like a stubborn clog reoccuring over and over?? Any info or ideas will be greatly appreciated. thanks