Larson finally stumbles in NASCAR's championship. Was it just a bad day or sign of serious trouble?

Larson finally stumbles in NASCAR's championship. Was it just a bad day or sign of serious trouble?
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Kyle Larson, driver of the #5 Valvoline Chevrolet, pits during the NASCAR Cup Series Freeway Insurance 500 at Phoenix Raceway in Avondale, Arizona, on Sunday.

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