Same problem here, however today it's been alternating with crashing to the desktop, so that's new and exciting. Logon, disconnect. Logon, crash. Verify, login, disconnect... I want to play, dammit :p!
Finally downloaded, been playing for 4 hours. For 3 of them, I've been stood in the Earth spacestation not being able to do anything. "Server Not Responding" all the time since I started playing, but now it's just completely ground to a halt!