Hi. I’m experiencing this issue too. A lot of the graphics (portrait, menu background) not loading and unable to play any form of multiplayer (which is all I play).
I’m running a MacBook Pro 2017, 3,3 GHz Intel Core i5, Intel Iris Plus Graphics 650. Mojave still up, so not a Catalina error.
The error comes and goes, and auto resolves after an extended period of time (10-30 min). I have also experienced it with two different internet providers in two different cities. The frequency of the issue is increasing so that I can rarely play more than a game or two before it kicks in and prevents me from keeping playing. Have re-installed the game. Reboots of the game/computer doesn’t change anything. My work-around is minimising the game and doing other stuff, occasionally looking if it has resolved by itself. But since I mostly play with RL friends this is not a sustainable solution. I play on EU servers but have encountered it at US servers too.
Here is my tracerout and ping etc while the game didn’t work (10 min ago): pastebin: 8aUSGVTj
And here it is from just now (10 min later) when it does work: pastebin: qXVLA3rs
Thank you for looking into it!