– Mercedes boss Toto Wolff has admitted that the squad needs to improve its reliability as the championship fight enters its decisive final stage, after Nico Rosberg was forced to retire from the Singapore Grand Prix.Nico Rosberg lost the lead of the Drivers' championship to team-mate Lewis Hamilton after a steering column wiring loom failure left him starting from the pits, before he had to retire due to the persisting problems.Mechanical issues have impacted both drivers this season, with both drivers having retired twice due to mechanical failure, while Hamilton started from the back of the grid in Germany and Hungary after problems in qualifying.Wolff admits that it is an aspect...
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