Who did you play? How is anyone supposed to identify it?
latest win not recorded

If it has only happened twice in over 1500 games, then the error rate is pretty good. It isn't the best to lose games but sometimes, glitches happen. But as notmtwain said, more details would help and really, a ticket to support would probably be the better way to get help on that issue.
https://support.chess.com/customer/portal/emails/new


Games do get wiped out when the server restarts but usually they make multiple announcements that they are going to do it and telling people to log off and not start any more games.
You say your game was finished. Any games finished before a restart aren't affected.
I also lost a won game from my list, but have far fewer played (<6 so far), so it's not just a random event. The game just disappeared. This should not happen.

I played a game and won but it's no were to be found. Neither I got points for it. It just vanished. This has happened to be twice in over approx 1500 games I played. Please check if there is an error from your end.