Esteban Ocon and Oliver Bearman say inconsistent car performance is holding Haas back.

Haas has gone four Grands Prix without a top-10 finish after scoring points in five of the first six rounds. The team has slipped into the midfield despite introducing upgrades.

Ocon said changing straight-line speed and downforce balance had left his car operating normally at only two races, although he does not believe the chassis is responsible.