Sirius Wouldn't Load, What Is The "Control/Alt/Delete" Equivalent To Reboot ?

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Occupied Calif.
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2019 CX 5 GT-R
I was going to make about a 45 minute drive yesterday. Sirius would not load. I pulled over after a couple of minutes, shut off the engine and restarted the car. Still no Sirius. The Navigation feature worked normally. I could only get AM radio, and could not switch to one of the USB drives to listen to music.
After I got to my destination and restarted the car for the drive home, Sirius booted right up and everything worked normal.
I thought I saw a procedure where you pressed several buttons at the same time like Control/Alt/Delete to reboot the infotainment ? Maybe Home/Nav/Music or ?
 
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