ChatGPT providing broken links as a source

Why has ChatGPT been providing broken links as a source since last week?
Is there a way to compel him to provide the relevant source link? When I tried to ask the Chat, the answer was that the information was updated to the end of 2023, but it worked until two weeks ago.

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Welcome to the forum.

Without seeing more details such as the prompt, the reply, checking the supplied links and know valid links the best I can offer is that some links may be hallucinations.