This is a server stability issue. It's hit or miss for me. I got the error the first time I logged in, changed nothing on my router, and got right in the second try.
This reminds me of a similar problem I had with IO Interactive and Hitman a few yearw ago. I had constant stability issues and disconnects, but ONLY when playing Hitman. I have great Internet speed, for an American anyway (fluctuates between 120 and 150mb/s). I use a Netgear Nighthawk router. I went on the Hitman forums and everyone there was like "I'm not having the issue, therefore it must be your router/ISP/modem". Nope. Turns out several others were having the same issue. It just took IOI a long time to fix all the errors and stability issues on their servers. Today I can play Hitman with no DCs.
The reason this happens is because Hitman and Elite both follow the same model, in that online connectivity is required to play AND to save/load/access data. When we get an error trying to load data from THEIR server, THEIR server needs to be fixed. I have no issues with any other game I play online currently. Why is Elite an exceptional case all the sudden (after the recent update), where I have to change settings on my router if I want it to work 100% of the time? I'm not even that tech savvy and I recognize the problem is on their end. Come on, now.
EDIT: I'll also bet my arx that this issue will eventually be fixed with an update, and we won't have to touch our router settings. This all started happening after the arx update. It's not our ISP or router. Everything was working fine before September.