Can't use FaceTime since update the new iPad To 6.1
I have two new iPads and a MacBook Pro. I use FaceTime everyday to communicate with my wife. But since I updated one of my iPads to 6.1, FaceTime turns to not reliable. Every time FaceTime shows poor connection then turns black screen in 20s after they are connected. At beginning I thought it could be network
Issue, but I just found that my 5.1 version iPad doesn't have same issue through the same network and my MacBook as well.
What should I do? I try to restore the system, but it seem nothing happen.
iPad (3rd gen) Wi-Fi + Cellular