I think I discovered a cause of my games being disconnected after sending the drawing, apparently (we've been testing it with my friends) if a drawing contains much information, the server cannot send it and disconnect the player (who is asked to draw again when reconnecting), for example (we play infinite time rounds, and we take about 20 to 100 minutes per drawing) a drawing without so many color information is sent every time, no matter how much time has passed since the start of the round, but a more complex drawing with lots of colors and lines gets you disconnected no matter how much time you took to draw it
From yul in discord: