It's just a computer generated message. Don't worry about it. If they didn't message people for disconnecting, the kids would do it all the time. Nothing will happen unless you have many disconnects and then it's like a 5 minute timeout or something.
I got a warning about 'intentional abort' but I had severe wifi issues
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tha same thing happened to me
I got a warning about 'intentional abort or disconnect' but I had severe wifi disconnection issues due to the very warm or hot (high temperature) days in The Netherlands ... I can prove I was winning had better position but could not finish my winning stance at least twice ... now I got on top of that great loss a "unwarranted" warning from chess.com THIS IS NOT FUNNY :/