Ditto ... I just got my Flex box & remote and discovered the same problem. Checked the Flex FAQs & found nothing that describled the Flex box's operations. Contacted customer support. The agent was sure that the Flex box does turn off via the remote and was sure that I had a defective remote. The agent also told me the obvious that I could unplug the box to power it down. I'd already done out of frustration.
I told the agent that it looks like the box is designed to always remain on. I also told the agent that the power buttom was probably intended to be used when paired with the TV to turn the TV on/off. The brochure that came with the remote does not describe the function of the remote's power button.
It seems to me that having the Flex box always powered up and connected to Xfinity via the internet will up my data usage, even if its minimal.
Also and even though the remote's voice feature is supposed to manual (ie. works only when you press the voice control button), I noticed that the voice control button light routinely flashes as if it was actively listening for a command.
Thanks to the ex-Comcast employee for his insight.
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