washing machine drain

Thank you to all the knowledgeable people who help on this forum. I have noticed that when our washing machine drains, water comes out from behind the wall in the finished basement. I confirmed the water is not coming from the machine itself, so suspect there is an issue with the drain line...

Have a frustrating situation with a common issue: washing machine drain pipe is overflowing at the wall. Older house with narrower pipes, but have run this same machine successfully for the most part for five years. It would occasionally back up when using different cycles but now it won't run...