Its not unknown... Apparently some people are too lazy too read the posts here. The server is limited to 200 people and the disconnect is a known issue.
And you didn't saw the 100 posts of Disconnects? Those posts are annoying, they know that the disconnect happens, you aren't the first person. Apparently you hadn't a minute time to check the first page.
How many more times...
The servers are full and overloaded, thousand of people want to play right now, this doesnt work, it never did, neither for those guys nor for bigger companies(tho those are plain stupid since they know that this will happen and got the capacities.).This is a STRESS Test, it was obvious from the start that it wont work perfect with so many players.
Just chill your beans and wait ffs ...