I seem to be having this problem also. Login fine, select character, goes to the map/loading screen and in about 2 seconds instead of bringing up the in-game UI it just crashes to desktop with no explanation. It's happening to any of my accounts.
Edit: Also, in case it's relevant, if i am using my phone's wifi it works, and if i use my home router the problem persists. Some sort of IP issue?
Resolved. Reset IP on home router and seemed to fix the auto closing error.