Yay, I'm getting this too. Was trying to go to Cardassia system when I got kicked, now it comes up every time I log in. Klingon character loads fine. (But I really want to get back on Fed because I'm trying to make it through Cardassian story arc before wipe)
I played for a while more on my Fed Character and it happened again while warpiing to the dace system. So I went and checked, I could log in and play on my Klingon character. But couldn't get past the Loading screen on my Fed one, until a few minutes had past. Server Load issues?