I get that on New Romulus. Their tech support has never helped at all. I can only guess they do not support AMD/ATI cards, because every person I ask that has that error has one of those cards. I have not been able to play on New Romulus for almost a year because I crash within 15 seconds when I get there.
DAY 5: Finally the problem is solved, no more "server not responding"!
"The needs of the many outweigh the needs of the few"
I also have a similar problem in the last 2 weeks - unexplained hangs, no error message, nothing in event log and hardware tests show no fault, problem only happens with STO. My video card is a GT 540m with 2gb of ram - I am now at a loss to understand or explain it. I have re-installed all relevant drivers and I am now setting the Video Card Settings in Options to Directx 9. My back up machine runs without issue at this setting.