Radius sleeps after unplugging power cord

After my Radius is fully charged, when I unplug the power the laptop will immediately sleep. When I wake it up, it runs fine for hours on battery, as expected. Why on earth does the laptop sleep when unplugging the power?
It's really inconvenient because if I'm playing music while it's charging the music stops when the laptop goes to sleep after I unplug it!
I cannot seem to find the right series of options in the power control panel to prevent the laptop from immediately sleeping when I disconnect the power cable.
Please advise.

If you can't solve your issue and no one in the community can help, contact support to speak with a tech support agent at (800) 457-7777.
- Peter

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