Here's more or less the answer from Help & Support:
Aborting games too often will temporarily suspend your ability to abort games. This means that if you cannot play, you will have no choice but to resign (or risk further sanctions described above, by abandoning your game or disconnecting). If you have to abort, then do so of course, but whenever possible, use the features available to minimize your need to abort chess games!
Do not Abort games if your opponent will not move at the beginning of a game: The server will do it for you!
On his or her turn, each player has 15-20 seconds to make their first move. If this does not happen, the game will be automatically aborted. This has a negative effect on the Fair-Play record of the player failing to move. (But if you hit Abort, it affects your record! It's best to be patient for a few seconds.)
6 times a row!!
And after all I have got 6 warnings about fair policy!
Is there any difference between user aborting (disconnect or game was abandoned) and server aborting?