According to Racing Point, Stroll's drop-off in performance in the Turkish GP was due to front wing damage that could not be seen in his pitstop.
https://www.motorsport.com/f1/news/damaged-front-wing-caused-strolls-loss-of-pace-in-turkey/4911516/
https://www.motorsport.com/f1/news/damaged-front-wing-caused-strolls-loss-of-pace-in-turkey/4911516/
After a stop for a fresh set of inters Stroll's pace dropped off badly and he fell back to an eventual ninth place at the flag.
It was only when the car returned from parc ferme to the garage after the race that previously unseen damage to the underside of the front wing was discovered.
It backed up the team's live data that had indicated a loss of downforce that could not be accounted for.
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