Getting the same thing now while attempting to explore the cluster off Romulan space. Sorry I forgot the name.
Seems like this only happens (for me anyway) while attempting to explore those unknown systems in the exploration clusters. I purposefully avoid them for this reason.
I've been having problems since Friday as well, does anyone who we can e-mail about this, I just bought the game last wk and I'm using my 30 day free thingy to play at the moment and I don't want it running out with me not having had a decent run at this game.
I've had this issue since their two hour downtime yesterday, then emergency maintenance planned for one hour which took two hours actually, and since then I haven't been able to connect. I see my character list then get disconnected. This is getting tiresome to say the least, a weekend where I have more free time than usual and I can't spend it enjoying STO until possibly next weekend now.