Hi, you can try to go to Recovery Mode, switch off your device, then press and hold Volume up key + Bixby key until the phone starts up and galaxy logo appears, scroll down using Volume button to highlight Wipe Catch Partitions and select it using the bixby button then select yes, then restart your phone. If the previous solution didn't work then you need to go to Safe Mode to check, press power button then press and hold the red button on the screen ( power off ) that will activate Safe mode, during Safe Mode you can check whether if this issue still exists or not, if not that means that one off your 3ed party applications ( or more than 1 application) causing this issue, you can delete the suspicious application, then restart your phone. Is the issue still exists then you have to rest your device to factory settings. Please let me know if this solutions was helpful.
