From what I've read (cuz I'm interested in this machine), Lenovo acknowledged the hardware issue and said it was a problem on models build before July of last year.
Obviously when you order online you can't really tell when it was manufactured. Supposedly they'll repair the ones that have this problem.
I had this problem. I had so many problems it was not worth repairing. Even w/ the "repair" to the WiFi it seems like people still get really slow download speeds on WiFi. Super weird. Do some research on this.