Radio wouldn't turn off. Appears it was doing a software update.

[studly]

In the past two days, I noticed that the radio in my 2021 Suburban was not shutting off when I stopped the engine and opened the door. 

In one instance, I shut off the vehicle, locked the doors, went into a convenience store and, when I came back out, the radio was still playing.

 

Today, after similar events, I arrived back home and pulled in the driveway (within my WiFi range) and the display said that there was a software update to perform. 

I let it perform the update and, now, the radio shuts off properly when I stop the engine and open the door.