Many people have made posts like yours. However, given that 10,000+ are playing at any moment, the complaints amount to only the tiniest fraction of all the games being played. (If the server were responsible for dropping the connection in even 1% of the games, there would be hundreds of complaints a day.)
It is most likely that your device just dropped the connection. Wifi connections are often unreliable.
Try to get a better wired connection.
Does anyone have an issue where I make a move as a white piece and the system sits on the black not making a move for 5-6 minutes and eventualy it says that I abandoned the game and reduces my rating? I have sent a message to the support as well. Appreciate if anyone can share if there experience similar issue. Thanks.