Mi Air locked itself randomly, very annoying if you have a passcode.. Went online and found old threads referring to the lock/unlock with a cover feature. The random locking only occure when using a cover in the "open" position, flipped to the back of the device. I turned "lock/unlock" feature off and the issue went away. I guess the magnets in the Air smartcover are really strong, i never had this problem with my iPad 4. Are other Air owners using smartcover experiencing the same issues or is my iPad Air super ultra mega sensitive?