Player has disconnected and cheating?

Anyone else having issues with the below message? I bring this up because I have been in games where I am slightly ahead in material, a good deal of time has elapsed and then I see the below message. Out of nowhere, these players are making pretty good moves. But these moves almost seem 'automatic' and it takes these players less then 10 seconds to make. Then when I do the game analysis and they have blunders and mistakes at the beginning and then at the time of disconnect, they start making, 'Best' moves. They are finding pins, all the forks making decent sacrifices... It's like I am not even playing the same person anymore. I dunno, maybe they are just really great middle/end game players, but it just seems way to coincidental that they are getting so much better after this message pops up.

I typically play the 10 min. games because I do not feel I am all that great at the 3 min games.

Please see https://www.chess.com/forum/view/community/discussions-about-cheating