Murloc holmes is know to cause disconnects.
It’s not something that a player can control and abuse but players must pay attention and restart game as soon as possible.
Yesterday i was playng duel and used murloc holmes , first choice was visible ,2nd choice was visible but when i pressed to select it got stuck and 3rd choice never appeared.
I restarted game asap but on reconnecting it was not showing me 3rd choice , turn passed to enemy and he was hovering cards but not playng them , so i got an easy win.
You are using the tracker so i suggest to put turn timers , if you don’t see rope at 15 sec remaining thats a 100% game to server disconnection.
Red outlines and Arrows use a different connection (player to player) as explained here