I was just kicked out of 3 games in a row. I don't have an issue with my internet connection. I know this because I'm constantly connected to another server for work. I tried to play, while taking a break, in the seafarers tournament and it's impossible. No wonder the other two games I did play earlier had one player exit. It can't be this common - there is clearly something wrong with the catan servers. I was also like you -- got destroyed by AI in a game someone apparently left, but I suspect that they are not "leaving" on their own now...