What happened: A rear-wing failure sent a Red Bull into the gravel at Stowe late in the British Grand Prix. The car had been contending for third despite handling, electrical deployment and gearbox problems.

Why it matters: The second rear-wing-related failure in successive races intensifies concerns about Red Bull's reliability and driver safety. It also cost the team a potential podium finish at Silverstone.

What to watch: Red Bull's investigation must establish the cause before the next race and determine whether corrective changes are required.