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I thought I read somewhere that you lose all your curation reward even if you up-vote it again later. Not sure where I read it but it stuck in my head. Plus you get the warning saying that you lose the reward. Not sure if that would mean permanently or just until you up-vote again.

You get a warning saying "Removing your vote will reset your curation rewards for this post." which makes sense - no vote, no reward. And if you don't vote again you won't get a reward. But if you do vote again you'll get a reward based on the time you re-voted. So you don't lose anything unless you don't re-vote.

Yeah nice. Didn't notice the word "reset". That makes perfect sense. Thanks.