I was doing puzzles, and I just solved one. Then, a message popped up: "Oops! Our servers made a dubious mistake. Please try again later" or something like that, and I lost 30 puzzle rating points!!! Idiots! And what will happen if I'm in a live game, huh?
And now I have to solve 7 puzzles in a row to get back where I should be! Now, I will use the hint hack, where I ask for a hint, then I quit the puzzle, then I come back and I solve it. Unfair rating loss, unfair rating gain!