Nest co-founder and CEO Tony Fadell is leaving the company, a move that may mark a shift in strategy for one of the early stars of the Internet of Things.

Fadell founded the startup, which makes connected thermostats and other smart-home gear, in 2011 with co-founder Matt Rogers. Google bought Nest in 2014. In a blog post on Friday, Fadell didn’t say much about why he was leaving but said he would become an advisor to Alphabet, the parent company of Nest and Google, and its CEO, Larry Page.

The resignation came after news reports that said Nest was suffering from internal turmoil. In his parting note, Fadell said the company was growing fast and had a bright future.

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