If any of you still having battery issues, wifi calling issue etc, please please update to this update that was released two days ago. It is a heavy one with a size of approximately 524 MB. It will resolve all those issues. I have seen considerable improvements in battery life even with dark mode off and my WiFi calling is remaining stable without switching to cellular preferred. Also, they have introduced a timed dark mode and more streamlined SmartSwitch to backup your device. People, pleae update and see the difference.