Sometimes when I die and press give up, the screen freezes on the "memento mori respawning in 5 seconds" screen. I have to exit the game and re-enter to fix it. I will have to do this when my survivor does not revive me. I have seen a few times if his equipped weapon breaks he will not revive me. Also, even if his weapon is perfectly fine, he will sometimes just stand there and not revive me.
Just happened to me in forest realm first main fight.