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Lewis Hamilton questioned Mercedes' engineers after he was forced to retire from the Malaysian Grand Prix following an engine fire.
Hamilton was forced out 15 laps from the end of the 56-lap race at Sepang with an internal engine combustion, and questioned why he alone was suffering reliability problems when Rosberg seemed to come through unscathed.
"My question is to Mercedes. We have so many engines made for drivers, but mine are the only ones failing this year. Someone needs to give me some answers because this is not acceptable," he told BBC Radio 5 live.
"We are fighting for the championship and only my engines are failing. It does not sit right with me.
"I will try and recollect myself and try to get myself together for the race next week. Someone or something doesn't want me to win this year but I won't give up. I will keep pushing."
Mercedes executive director Paddy Lowe does not understand why Hamilton has suffered so many problems, when the Williams, Force India and Manor teams [who Mercedes also supply with power units] remain reliable.
"It is difficult," he told Sky Sports.
"No failure is planned. We work as hard as we can to increase reliability. We have eight Mercedes power units in the field and there is no pattern for why it should fall on Lewis Hamilton's car."
Mercedes non executive chairman Niki Lauda says Hamilton is right to feel "let down" and vowed to correct the problems.
He told Sky Sports: "I am really upset about myself and my organisation because we should not let him down with an engine failure. It was a fairly new engine, it was not old in the car. What went wrong I do not know and we will work to correct it.
"I am taking him to Japan tomorrow in my plane. I hope I can bring him up. The championship is over when the last race is over, 23 points is a lot but you never know.
"We have done nothing against him. We have people working for him, we are proud of him and these things happen."
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