Myself and several of my FC mates have also been experiencing severely latency, packet loss, and sudden disconnects (90000 error) since last week.

Tested it and it occurs on both a wired and wireless connection. I also tried pinging several different servers on SE's end and most of them are showing packet loss anywhere from 1-10%. I also tested the servers in the connection path leading up to SE's end to see if they could also be responsible, but they are all showing 0% packet loss. This, coupled with the fact that it's affecting several different people from different parts of the world, leads me to believe this is strictly an issue on SE's end.