Renault has apologised to Carlos Sainz and Toro Rosso after a relatively minor issue forced him out of his fourth F1 race in succession during the Belgian Grand Prix.

The Spaniard had qualified in tenth position but a loss of power on the formation lap forced him to pit for checks, with mechanics tracing the issue to a loose connector in the engine.

Though quickly fixed, Sainz was nonetheless left two laps down and in an effort to save mileage on the Renault power unit, opted to withdraw from the race.

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Now the fourth race in succession that Sainz has been forced to retire from top ten positions, Renault Sport track support leader Cedrik Staudohar insists it won't happen again.

"It was in part a difficult race," he said. "We suffered a loss of power on the formation lap with Carlos due to a loose connector in the engine. Once it was fixed in the garage he could get going again, but as he was two laps down, the race was effectively over. We have to apologise to the team and ensure that this won't happen again."