The steps listed below will keep the radio connected to the WiFi.
1. Press and hold the Voice Command/Alarm.
2. Say "Settings".
3. Tap Wi-Fi.
4. Tap the icon located in the grey bar at the bottom of the screen that looks like a 3 dots arrange vertically.
5. Tap Advanced.
6. Tap Keep Wi-Fi on during sleep.
7. Tap Always.