Please run Malwarebytes AdwCleaner, Malwarebytes and your AV. If you get blue screens and/or restarts upon detection please run these programs in Safe mode. And if you can't install or run them try using Stinger or Chameleon
Please check other similar topics before posting. The server has a cap which limits players at certain number. If you logged in and connection lost appeared, everything is normal. If your game lost connection before the log in window please check your anti-virus or firewall.
Oh sorry
One of the devs @fiki574 answered to the same question as yours.
"And how do you think we're going to fix it? Your provider is the problem, not our launcher."
I'm not sure. Just saw one guys log and there was a line which said that. When I was online I saw 3 pages of players. So if someone remember how many players there were in a single page please do your math.
I asked you for the error, but chat box went missing. Please post it.
As Hawk mentioned the Open beta is going to run while they are going to fix everything. So no date was given. Not sure, but I think that current cap is 50.