Hello LKLeo. I am Avinash, from Samsung.
Firstly, we regret learning from the experience that you are facing currently. Rest assured, we will provide you with the best solution to resolve your issue. You may follow the below steps in order to narrow down the root cause of the issue :
1. Soft Reset (Force Restart)
2. Safe mode
3. Software Update
4. Reset Settings
Kindly refer to the link below for further detail in regards to the troubleshooting steps above and perform above recommended steps only : https://www.samsung.com/sg/support/basic-troubleshooting-tips-for-galaxy-mobile-devices/
However, if the issue persists, we would like to propose the Smart Tutor. The advantage is, we will be able to assist you with further troubleshooting over the call. Please call our Samsung Care Line 1800-726-7864 regarding this service. Our experts at Samsung Care Line will advise and assist you in details.
Hope this can help you.