All of these links are from stories about people that know or knew someone that is a friend of a friend that heard a story about this and it is at least two years old. If you read the whole link, it seems that most manufacturers are using the same design bolts. It sounds more like internet ninja's reporting on hearsay stories. If these stories were absolutely true, Mossberg would have had a recall on all ATR rifles by now.
There is questions in each case as to whether the ammo was factory or reloaded and whether or not there might have been an obstructed barrel. The other question is whether or not the bolt was disassembled by owner to clean before shooting and reassembled incorrectly or damaged.
I researched the recalls by Mossberg and found this link from their web page.
http://www.regcen.com/howa/
There is no recall on ATR's, it is on the Howa's and the malfunctions were on Howa's, not ATR's. Some people get their facts confused when they repeat second or fourth hand info in public forums. This story originated in 2007 and there have been no followup postings or recalls, just people reposting incomplete info. I am not convinced anyone is doing it on purpose, but through lack of research. As said here and elsewhere, people keep saying that such and such gun is the same as such and such gun, before you know it they become the other gun in repeated stories.