M30s camera lacks optimization, they have already solved it and provided the solution in the form of M31. Sorry to say but this is what Samsung does all the time.
To resolve " Camera "issue kindly follow the given below steps:
1) Reset camera settings: Camera > Settings > Scroll up > Reset settings > Tap on Reset.
2) Turn on/off the Auto flash as per requirement (If Available in the Device).
3) Check device in safe mode: Press and hold the Power key, when Power off icon appears >Press and hold the power off icon. Exit safe mode: Hold the power button and select restart on the device.
If the issue still persist, kindly register your concern in Samsung Members app (Samsung Members app > Get help > Feedback > Error report/ask question). Note: Please send device log files within 15 minutes of issue occurrence along with the exact issue details.
