I had a similar experience with some fabric from Hobby Lobby ... only once. Finished a lap quilt, washed it, and some of my blocks frayed so badly they came loose. It is my only UFO. I just don't want to take the entire thing apart, recut my squares to a smaller size and start over. Actually, I have it draped over the back of my sewing chair for added back support ... and it just may stay there.
I have purchased other fabrics from Hobby Lobby and had no problem. If I still had the selvage we could see if it came from the same manufacturer ... but I don't.