If you only abandoned one game there's no ban. The warning is simply warning you not to do it again or you may get some sort of repercussion if it's a repeated habit. The only penalty that you recieved is that of the rating you lost for abandoning the game.
My connection issue have cause me a lost and an abandon game ban warning NEED SUPPORT
Sort:
https://www.chess.com/game/live/142094724876
i lost this one even though i'm in winning position cause my connection suddenly shut off even thought i stare at the screen for 2 minutes straight and my internet connection of my computer is excellent so it server issue, need some moderator to take a look.
Also i got a game abandon 30 minutes ago even thought i didn't plan to because of connection issue and got a warning, my internet was excellent so yeah it server issue, please remove the penalty if apply.