What events would trigger linguistic hyper-evolution in a spacefaring civilisation?

Let's say that in an alternate universe, humans developed on a relatively small supercontinent, so their languages and cultures were somewhat similar. After a while, all of the nations merged into one nation with the same language. Soon afterwards, they developed interstellar travel and proliferated across a handful of nearby solar systems.

However, something happens to this empire, and the interstellar language quickly fragments and evolves into completely distinct languages. This all happens within the span of a few centuries, enough for humans to re-establish communications and re-connect the empire. However, when they do so, they discover that the other humans speak entirely different languages.

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What events would trigger linguistic hyper-evolution in a spacefaring civilisation?

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