Don't listen to that other person. It's not just you, and opening your NAT or opening ports is almost guaranteed to not help at all. It's happening to tons of people that never had problems before. I have the exact same problem as you. I get a beaver error outside of the tower from time to time, along with the other codes sometimes, but the vast majority of the time it's when I load into the tower. I also didn't have hardly any problems with error codes prior to Season of the Worthy. I averaged less than one a month over the last 7-8 months since the game launched on steam for a total of around 5 or 6. As soon as season of the worthy started, I get that every hour, sometimes more. Edit: Also, I'm on a wired connection, as are a lot of people that are having problems, so it's not just people that are on wireless that are affected. If you can switch to a wired connection easily, it wouldn't hurt to try, but chances are it's not going to help.