Secure folder Problem

I have a Problem with creating secure folder in my A51 Device ( one ui 3.0 ) . Previously i used secure folder. after update my Device to one ui 3.0, couple of days later i Deleted secure folder but now i need again secure folder. that's why i try to create again secure folder but i face a issue. when i try to create secure folder Device rebooted automatically. while secure folder creating process , it show me Creating a secure folder but after minute and a half. its reboot automatically.  i try almost every thing clear cash/clear data , Disable secure folder and reboot Device Enable secure folder again but Problem is not fixed. i do clear cash partition in recovery mode. Please help me to fix this issue 🙏😔. i need this