Right, I had an issue myself with disconnecting during loading screens and after waiting for nearly 3 days for a reply on a support ticket I have taken it upon myself to do a little digging to see what what was happening.
When I was playing beta I was checking the in's and outs of the launcher and game etc and noticed that I coudl change the proxy to EU to suit my needs. I believed this would improve my connection to the servers which initially, it did. Then they patched the game. Because I had been playing flawlessly for a few days I thought nothing of the proxy settings until I looked into it.
I decided to set the proxy to none as a bit of fault finding. I logged in and repeatedly entered and left a system and did a few away missions and all successfully without disconnecting. I then enabled the proxy again and bang! the problem was back.
So for anyone still having issues with loading screen disconnects. When you open your launcher, go to options and set proxy to none. Hopefully this will remedy your problem and you will be able to play without the annoyance of disconnects.
Hope this helps most with problems, if not then I feel for you , and I hope that Tech Support gets to your ticket in the not so distant future!
the reason the proxy is ther is for those with isp's that throttle ther conection to the game sever causing huge lag. so if you are not haveing lag with the proxy set to none you should not be useing it.
as for me i have to use the proxy, it is ether constant unplayable lag or random disconnects and long log in times /sigh