Try this:
Clear Cache Partition on Galaxy S9?
Turn off your phone.
Now go to recovery menu on your phone by pressing :
“Volume up“,”Bixby” and “Power” buttons at the same time. Leave the buttons as soon as you see Android mascot in the background. It will take you to the recovery menu.
Use your volume rockers to navigate to “Wipe Cache Partition” option.
Select this option using the power button.
Once the process is complete restart your phone using the system reboot
Or use same procedure .. this time do a factory reset ..