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A nightmarish one-off or an unwelcome sign of a wider problem?
That's the question prompted by a "mind-boggling" drop in performance from Mercedes at the Brazilian Grand Prix, which has undermined recent optimism about its Formula 1 upgrades.
Its showing was met with condemnation from Mercedes boss Toto Wolff, who was also incredibly apologetic to drivers Lewis Hamilton and George Russell - even if his argument is that such races justify the concept shift the F1 team is making for 2024.
So while Mercedes scratches its head and the cause remains unknown - fully, anyway, for now - our latest video sets out what Mercedes struggled with so badly that meant its weekend unravelled, and whether there's any real dent in the team's confidence or whether this is just being seen as an outlier.