Dear Samsung Member,
Greetings from Samsung Customer Support!
Please be assured and to resolve "Battery drainage" issue kindly follow the given below steps:
1)Battery optimization:-Settings>Select Device Maintenance/Device Care>Optimize>Optimize all options like Battery, Storage and Memory
2) Close background running apps:-Tap on recent key and close the background running application.
For more information on battery drainage please click on the link below:
You may need to try clearing the app cache and data within your Settings to resolve "app crash" issue:
>>>Launch your settings>apps>crashing app>storage>touch clear cache &clear data.
If the issue still persist and about the other issues , 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.
Thank you for writing to Samsung.
Samsung Customer Support