There is a view that is gaining currency in the Formula One world that Lewis Hamilton is losing the plot.
In the last two races, Canada and France, he was the architect of his own downfall.
From points leader, he is now fourth in the drivers' standings.
After the race at Magny-Cours last Sunday, the British driver ignored requests for TV interviews and stormed back to the McLaren paddock offices.
It raised speculation that he is finding it difficult to deal with the pressure generated by failing to pick up a single point in his last two races.
A pair of world champions believe he needs to take it easy on himself, if he hopes to turn potential into a world title.
'He must not get too excited when he does well nor too dejected when he does badly,' said Niki Lauda, who won two titles for Ferrari in 1975 and 1977 and a third for McLaren in 1984.
'The lesson I learnt early on at Ferrari was to keep my feelings suppressed when I won races.
'I would go to the podium, collect my trophy, shower the champagne, then go away and make sure I never read the next day's papers.
'Once you've learnt to do that when you're a winner, it becomes correspondingly easy to handle when you don't win.'
Former three-time world champion Jackie Stewart believes that everyone, including Hamilton himself, must realise that he is still relatively inexperienced.
'We should remember that Lewis has only been in F1 for 15 months. He's not the finished article yet - and it's wrong to think that he should be,' said Stewart.
'He might not like to hear this, but he has a fundamental lack of experience at the top of the sport. If he asked for my advice, I'd say, 'Take your time, and don't expect too much of yourself'.'
In Canada, Hamilton rammed Kimi Raikkonen's stationary car in the pit lane and took both drivers out of the race.
In France, a drive-through penalty for straight-lining one of the corners in the first lap compounded the 10-place grid penalty incurred for his mishap in Canada.
His teammate Heikki Kovalainen started 10th and finished fourth for five points.
Those points might have been Hamilton's, had he not been so desperate to make a point early in the race.
But Stewart also questioned the decision of the FIA (F1's governing body) to penalise Hamilton.
'A lot of people - and not McLaren personnel - are saying that the FIA are more interested in finding faults at McLaren than at other teams,' he said.
'For example, in the French race, Raikkonen's exhaust system broke and part of it was visibly hanging off the car. Why wasn't he called into the pits to have the loose piece removed?
'The loose bodywork flew off the car, which could have been dangerous to the public or to another driver.'
Hamilton was asked whether he felt drivers in McLaren cars somehow attracted penalties.
