Red Bull is investigating whether a fault in his chassis is causing Sebastian Vettel's 2014 trough.
Team boss Christian Horner says the reigning quadruple world champion is lacking the "feel" for the RB10, while others think the German is simply being outclassed by his new teammate Daniel Ricciardo.
Dr Helmut Marko, the champion of Vettel's career since his boyhood, has some other theories.
"When downshifting, Sebastian needs a stable rear for his special style of driving. With all the new systems, he doesn't have that yet," the Red Bull director said.
Austrian Marko tipped Vettel to eventually get it right.
"In 2012 it was the same, and by the time he was happy...
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