All of us at least considered, if not suspected this. I honestly haven't read anything about the cause, or what's being purported as the cause.
I'll have to try and find some of those stories on FB.
I read somewhere it was all Halliburton’s fault because they must not have cemented something right....a-shoot-from-the-hip comment w/absolutely no evidence so far to back it up.
Here are links to the stuff I was reading last night.
http://www.youtube.com/watch?v=mkTyRPm7ZOg
http://www.whatdoesitmean.com/index1367.htm