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...
This morning I kept getting a new error on the Windows app from Steam:
"Error server is blocked due to a long running script"
This afternoon, I can't even search for a game. I can't get past "Auto match" and "Custom match". I click on the button and the screen flashes and sometimes I can see the next screen before I'm back to the same spot.
21 Jan 2020 Unable to play. I can see in my network monitor that the application connects to Catan servers and has traffic. I just can't play.
23 Jan 2020 Still unable to play.
24 Jan 2020 Still unable to play.
1 February 2020 Problems have largely disappeared after a server update and I log out and back in