They can do what they want to fix it... but there will always be... an dupe glitch. Especially when kabam is "working" on the game.
Latest announcement claims ~15 minutes, and after such it will be unavailable for an unspecified duration. Dupe while you still can
No, but it is polite to warn people before disconnecting everybody isn't it? Else people will use their dungeon keys and then get disconnected