Having the same issue. Just started occurring today after packet.

-Logged on to regular server.
-Shot by another player
-Clicked respawn
-didn't respawn
-exited and connected to same server
-you are dead on screen
-waited 30 minutes and logged into same server
-waited 10 minutes tried random server
-every time, you are dead and respawn button is greyed out

I've tried changing names, closing out of the game and logging back in, changing servers, and checked server I died on to make sure they were running the current version. Nothing has worked, I'm still dead.