Former Formula 1 driver Heinz-Harald Frentzen has shared a pointed message on social media, seemingly aimed at four-time champion Max Verstappen.<br>"If you lose your motivation in F1, it's better to quit, or at least take a break. That's what I did. The sport is too dangerous if you lose your focus," the ex-Sauber driver posted.<br> <br>While it is not stated who the message is aimed at ...<a class='more' href='https://www.motorsport.com/f1/news/ex-f1-driver-heinz-harald-frentzen-issues-pointed-message-amid-max-verstappen-motivation-concern/10809014/?utm_source=RSS&utm_medium=referral&utm_campaign=RSS-F1&utm_term=News&utm_content=www'>Keep reading</a>