Tony Fadell is stepping down as the head of Nest Labs, effective immediately. The move is yet another in a tumultuous history since Google purchased the smart thermostat in 2014 for $3.2 billion, its third-largest acquisition ever. The deal brought in not only a hot product in a growing segment, but Fadell himself, a proven executive in the hardware space. After what Fadell calls a ‘grueling’ year, one that saw the failed release of a smoke and carbon monoxide detector (recalled due to software problems), Nest employees publicly complaining about his management style, and infighting over missed sales targets and botched…

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