Sergio Perez said his Red Bull team needed to redouble its efforts on improving reliability, or it will affect the title fight.
“It’s been a weekend to forget,” he said after Canada. “We think it was a gearbox issue and I got stuck in gear, unfortunately. Things were looking good, I had a good start, I was on the hard tire and making progress.
“We need to keep on top of the reliability because a zero when you are fighting for the championship is very painful and costly.
“It should have been a race where I could have worked my way through the field, so it’s a big shame. I felt I had plenty of potential in my race to make up a lot of places and recover good points.