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Sometimes there's a glitch/bug that stops others from reviving you. I've seen it happen a few times so it's just a random bug. Nothing you can do except use up that heart.
Chat bubble glitch happens very often - usually when there's a lot of people in a place and when there's a lot of chat spam. You can't really do anything about that too. You can try relogging but... I'm pretty sure the glitch will pop up again soon enough anyway. Just look at the chatbox.
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