This is how I fixed it. Hope it helps most of you guys.
First, go to Control Panel
Then go to "Biometrics" and click on "Biometric Devices"
You'll see "Validity Sensors Inc." Click on "Properties". (It should be under Validity Sensors Inc.)
A tab will open up and under the "General" folder, click on "Change Settings"
Another tab will open but this time you need to click "Power Management"
Uncheck the box "Allow the computer to turn off this device to save power"
It turns off if your computer ever gets under 20-% for it's battery life and it will automatically turn off. Not sure why it wouldn't turn back on after you charge it but I hope this helps!
