I think when you open the bottle you expose oxygen to the soda and then cap the bottle again leaving an air pocket. Causing some of the carbonation to escape the liquid into the air until there’s no more room to. It’s kind of like leaving a glass of soda on the table and eventually it goes flat, just on a smaller, intermittent scale.
I’m sure there’s a better, more scientific way, to explain it but that’s the just of it.
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