Going "unconscious" above 0% health
 

This hasn't happened to me at higher levels, but it happened twice within a few hours on a low level character: I have collapsed on the ground between 1% and 5% health and been unable to move or cast spells. There is no "You have been knocked unconscious!" message, but a third party view shows the character lying on the ground. When the character is finally slain, the unconscious and slain text occur simultaneously.

Yeah happened to me a few times too.
I think its the way health is calculated on this server, which is not the way as in classic. Check your healthbar, when you get hit and you will know what I mean. At first it shows more health lost than you actually did lose, and then it magically returns a second later. If that happens at low health you will go unconscious, even though you shouldnt.

This has gotten me killed a lot actually :p Often hard hitting NPCs like 1500 wurms in VP or raid bosses put me unconcious when they hit and then I will bounce back up above even 20% hp sometimes. It can be annoying.