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Hi Robin, I know that if you play the game on a mobile device you can lose both lives and boosters at any time because they are only saved to that device. So any crash or operating system update can cause you to lose them.
In the past week I saw one message where the person was on a computer and lost lives. It might be something new but lives are easily replaced so I don't know if it's a fix that needs to be done by King at the moment.