Confirmation from the club chat:
I had this error too, but only in firefox, not chrome. now it's working fine again. you still get the blinking?
More bugs
We believe we have found the issue, but it might not be an easy fix. We are working on it.
By the way, it shows that I currently play in Top Games list. But that game was finished yesterday. I do not know if the blinking bug is related to this fact or it is a separate bug of the game list.
I think blinking occurs in a game when some player is playing under and insecure wifi. Thats just my guess..
Hopefully this should be fixed now. Let us know if it happens again.
Today when I open https://www.chess.com/4-player-chess in Chrome the page is blinking. It shows the board for a moment then black screen for half a second and so on.
But in Firefox it works fine. Relatively fine, because the server lags and other players confirm that.