There is a bug in WZs that causes your character to become frozen in place, unable to move. You aren't rooted or stunned or anything, and after you die you still can't move after you respawn, which causes you to get kicked out of the WZ for inactivity. Using /stuck doesn't do anything. You can't use your CC breaker because you aren't CC'd, you are glitched out.
It seems to be caused by the game's physics effects (knockbacks, pulls, etc). Maybe its when you are affected by multiple of them at the same time? I'm not sure. Its a real problem with Scoundrel and Operative's new roll skills (Scamper and Exfiltrate). There are people complaining about it here. It might affect the Sniper/Gunslinger roll too, idk.
My Scoundrel healer guildmate is getting kicked out of WZs every night because of it, and has since given up on PVP. Please fix this so I have someone to heal me again. In game bug reports have been filed, but not responded too. I'm worried that since its an issue that only affects a small % of the population that it will be under reported and never fixed.
Oh, and its not just an issue with the rolling skills. I've had it happen to my Shadow once in the 500+ WZs I've played. It happens to Scoundrels/Operatives all the time though, to the point of making the game unplayable.
tl;dr: