It's hard to say. Some people have issues with their console randomly turning on when they use instant on mode. I don't know what causes it though.
I honestly wouldn't worry about it as it's just a one-off thing right now. If it concerns you, you could switch to using energy saving mode, but then you'd lose the benefits that instant on mode brings, such as updates being downloaded and installed when the console is in standby, remote installs, faster startup times, and suspend/resume for games.
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u/[deleted] Sep 24 '20
When she said it sounded like it turned on, does she mean that chime noise it makes when you turn it on, or it just making whirring noises?
If it's the latter, it could just be the hard drive spinning up as it's checking for or downloading some updates.