Dear Samsung Member,
Greetings from Samsung Customer Support!
Please be assured and perform following step to resolve the Camera quality issue:
>>Check device in safe mode - Using Safe Mode on a Samsung phone allows you to force the device to run the essential operating system, and disable most 3rd party applications.
To enter in safe mode: Press and hold the Power key, when Power off icon appears>Press and hold the power off icon.
To Exit safe mode: Restart the device.
And to resolve "device lagging" issue kindly follow the given link: https://www.samsung.com/in/support/mobile-devices/how-to-restart-the-device-when-freezed-or-hanged/
If the issue still persist, kindly register your concern in Samsung Members app (Samsung Members app > Get help > Feedback > Error report/ask question) along with screenshots, short videos and error log file, so that we can assist you accordingly.
Note: Please send device log files within 15 minutes of issue occurrence along with the exact issue details.
Thank you for writing to Samsung.
Samsung Customer Support