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That is usually a sign that the antenna lead has become disconnected. Check the antenna, and esp. its connector/connection, and clean it by rubbing the metal with a clean dry soft cloth, also, before re-connecting firmly.
After that, a Reset of the GPS facility would be appropriate.
And in the upshot if the error continues after that, you may, unfortunately, have a defective GPS in need of repairing.
Let me know if you need more advice as to any details, etc.