While it can be for a variety of issues, normally it is not throttling or anything related to your ISP regardless what SE say's(Aside from the random connection lost 1-2 times a month which most companies experience downtime at some point). Basically the typical 90000 error is due to some kind of overload to your wireless adapter. So when you get 90000 your adapter resets completely real quick, something in the programming is causing data to jam up and reset the adapter. I am not sure if it happens when you are wired then if so its worse than I thought.

I have attempted many things to fix this error even spending more money trying to fix it than I have on the game + 90days sub. First I called my ISP to verify throttling wasn't on, which is when I found out they were actually upgrading their hardware to make it even faster! Second I bought a better cable modem(Previous was 10 years old). Third I reinstalled the entire game. Fourth I bought a better wireless adapter. Conclusion? Nothing fixed.

So keep in mind, if you notice you lose internet connections for 1-2seconds at the same time as 90000 (Though you will only notice if you exit game super fast or mumble/vent d/c for short period) its overloading your adapter some how and I have no idea how to fix that or if you even can :/