Well I have had this happen to me quite a few times since the patch. As a holy priest in a BG it seems that if you are stunned and killed with enough time left on the stun to affect your spirit of redemption you will be completely stun locked and can't do anything from that point forward. When Spirit Redemption fades and you release and rez at a graveyard, you will still be stunned and not able to move, cast, nothing at all. Only way to fix this is to use a DC macro and log back in. Have had this happen multiple times over the last couple of days since I started BG'ing again.