When I do more than two loads of wash, water comes out by my toilet located on the other side of the house. If I wait 4 hours in between loads, there are no problems.
If water is backing up after a couple of loads, it probably means the backup is past the toilet and may be a clog in the main line. Your lines need cleared from a main line cleanout, which is a professional job for plumbing companies. Roto-Rooter can assist in this sewer cleaning. Call us at 1-866-960-7686) or schedule a service time online.