Sebastian Vettel has spent more time with the "comfort blanket" of his old employers at Red Bull while his title challenge has collapsed according to the team's former driver David Coulthard, who suggests the German has become unhappy with life at Ferrari. Vettel has seen his title hopes swept away in a five-race winless streak in which his best result has been third-place finishes picked up in Singapore and Russia. In that time, his main rival Lewis Hamilton has won four grands prix, a run stopped by Kimi Raikkonen's United States GP win. Vettel ought to have been in the mix at the Circuit of the Americas, but his chances were blown by a first-lap spin after contact with Daniel...
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