This is possibly the so-called "Connected Standby" (https://en.wikipedia.org/wiki/InstantGo https://en.wikipedia.org/wiki/InstantGo), an infamous Windows anti-f

This is possibly the so-called "Connected Standby" (https://en.wikipedia.org/wiki/InstantGo https://en.wikipedia.org/wiki/InstantGo), an infamous Windows anti-feature. I believe, although I'm not 100% sure, that in addition to turning on the computer without the user consent, it also puts the machine in a strange state where it's neither on nor off. According to the spec: https://en.wikipedia.org/wiki/InstantGo https://en.wikipedia.org/wiki/InstantGo, it's allowed to suck up to 7.5% of battery every day. As a matter of fact, my Surface device would lose more than 5% every day, and I'd find odd periods of wakeup in the sleep log (when the machine was supposedly fully shutdown).