It would have been handy to have some sort of notice beforehand. I don't know about other players, but when I saw the game was going into maintenance I didn't bother opening up the game for another 30-45 mins, despite it lasting for 5 minutes like you say.
i totally agree.
unfortunately this was one of those 'hey guys, if we dont fix this now we are screwed' moments so as soon as we knew we needed to do it, we did it. the tweet warning was the earliest warning we could have given.
we should have given it earlier if we could - i understand your feedback completely so just trying to let you know why we did what we did.