I'm on a Windows 10 machine. I found a setting that MIGHT be what I'm looking for - it hasn't ejected like that since, but I've only had it plugged in a few times and it doesn't happen every time.
In control panel I went to 'Devices' then 'USB' and there's a setting that says "Stop devices when screen is off to help save battery. If you're having problems with connected devices, clear the checkbox."
I don't know that this will help, since I'm running with the laptop plugged in, not on battery, but we'll see.
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