Problem phenomenon:
Do Not Disturb mode auto-activated while driving. But not set any timer or smart assistant.
Causes:
Silence notifications while driving feature of Google has been turned on. To limit interruptions like calls and text messages, the device can automatically turn on Do Not Disturb when you're driving. Your device uses motion and Bluetooth connections to figure out whether you're in a moving vehicle.
Solutions:
Please go to turn off the silence notification while driving.
All realme UIs: Settings > Google > Personal safety > Turn off silence notification while driving.