A similar update rolled out to the Lumia 930 yesterday. For those wondering, this is not Windows Phone 8.1 Update 2, but a patch to fix perioditic reboot issues:
The update bumps the OS version to 8.10.14234.375 and the firmware version to 02040.00021.15063.02004. If you're facing the issue and are yet to see an update, Microsoft has a fix.
Thanks Mohammed, Kavi Raj and Sadananda!
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Harish Jonnalagadda is a Senior Editor overseeing Asia for Android Central, Windows Central's sister site. When not reviewing phones, he's testing PC hardware, including video cards, motherboards, gaming accessories, and keyboards.