Since previous posts I made in threads others created (seemed to make sense as it was the exact same issue) either got ignored, or closed I will open one myself.
So regularly (but not always) I struggle to log in on Xbox One X. After starting the game I get stuck in an endless load screen before character select, eventually getting a 308 time out error if I don't close and try again before that. This is happening since the Waking Flame update. It has taken me anywhere from 10 minutes to several hours to get through to the character select screen. Once I get there I can swap characters, servers etc. with no problems at all for hours as long as I don't completely close the game. The moment I close the game the problem starts again.
Before I even try and start playing the game I delete the save file and I take the power off for about a minute to fully restart the xbox. I even went through a full reinstallation of the game twice (thankfully I don't have a data limitation and a good download speed). None of this permanently fixed the problem. I normally only have a wired connection, connection tests on Xbox are always fine, I also tried connecting wirelessly to my router and even my mobile phone, all these options gave me the same results. Sometimes it suddenly works, most of the time it doesn't.
The last few days the problem seems to be a little less frequent (to my shock I managed to get in directly two days ago!) But it is still an issue. I also know I'm not the only one with this problem.