Why would a previously spacefaring civilization become unable to build another interstellar ship?

I'm writing a story in which a civilization previously capable of (firmly technobabble-based) FTL travel has become stranded, orbiting an isolated star with no rocky planets. (There was a planet, but it was destroyed by their crash-landing in the star system.) The civilization is comfortably capable of forging an existence in artificial habitats orbiting their new star, but for the plot to function, it must be prohibitively difficult for them to leave the star system (to return home, or colonize elsewhere).

Their best chance would be to get their hands on an already-constructed FTL travel device, but I'm having trouble constructing a convincing (within-universe) reason why they couldn't simply build a new one from stuff they have at hand.

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Why would a previously spacefaring civilization become unable to build another interstellar ship?

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