NEW YORK (MarketWatch) -- GoPro Inc. shares GPRO, slid almost 7% in midday trade Monday, after a French journalist said Michael Schumacher's brain injury in a skiing accident last year was caused by the mounting of a camera on his helmet. "The problem for Michael was not the hit, but the mounting of the Go-Pro camera that he had on his helmet that injured his brain," Formula 1 commentator Jean-Louis Moncet told a French radio station. Moncet said the information had been given to him by Schumacher's son Mick. The son said the racing driver is waking up "very slowly" from a medically-induced coma. GoPro shares have more than tripled in value since their June IPO.