It means that they may have disconnected on purpose, in the hope that you would get frustrated and give up. So if that happens a lot with the same person, chess.com will investigate!
Fair play policy
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I just played two games and after the other players were taking a long time, their status said they were disconnected, re-connecting, then game abandoned I won!! It said the other player may have violated fair play policies? Anyone know what thats all about?