yeah, i also monitored game's resource usage in Task Manager. Should not be for this game, however, I see RAM usage leveraging to like 3GB and then crashed. My system is 8GB (and 4GB for VRAM) and that much would be enough to make it feel lil' cripple. Maybe it's the actual reason for now.
sometimes before it flew back to main menu once every game start, but i could join after one or more attempts. I know it's alpha test but yeah, this is not so comfortable to play, especially on lower end devices with little RAM amount (given 8GB and an optional graphics card is the basic criteria)