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The dissolved gas is driven out of the liquid as it freezes - not as it gets colder - gases are more soluble in liquids as temperature falls. As the liquid freezes, gas leaves solution and forms bubbles. Gases are less soluble in the sold phase than the liquid.
If you leave the softdrink to thaw, it should be OK unless there has been a leak and the gas escapes while it is frozen....
My physics is rusty these days - but this is what I remember....
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