I have just put a ticket in about this issue as have been having the same problem for a few days now . Did think it was my connection at first but now and more inclined to think it is a server issue for some people as there are a lot having the same problem. Hope they fix this for live launch or my 3 day head start may give me about 2 hours playtime if that . But as my ticket was numbered # 500,000 + , not holding out much hope :-(
Well I played last night and did not have any issues with being disconnected (Except one time after buying and customizing a new ship then trying to beam up to sol system). Thank you very much Cryptic for solving this issue for me and I hope most of the others in this thread. I was having this issue all the way from the beginning of the open beta and I am very happy to see that it is working great as of last night. Whatever you did, don't undo it!