Unfortunately this site is a bit of a memory hog. Other less well featured sites may work fine. Absolutely no guarantee any of the following will fix your problem, but they just might...
https://support.chess.com/article/213-how-do-i-fix-my-disconnect-lag-issues
It seems everytime I play a game it will cut off my internet out of nowhere and then by the time the connection is back up the game is aborted. I've lost 4 games in a row like this. It isn't the internet connection because no other website does this. It's like I make a move then my connection bar on chess.com instantly goes to red and it disconnects me.