It sounds like your drain is still partly clogged. A washer puts a great deal of water into the drain and a partly clogged drain just can't handle that much all at once. Every "real" plumber that subscribes to this forum condemns chemical drain openers. I'd suggest you try a different plumber. Make sure you contact someone who is in the plumbing business, not just a sewer service. Often these people do not have extensive plumbing training. All they can do is run the auger. That may be enough in most cases, but when there is a problem beyond a blockage, they run out of know-how.