Samsung is just not able to optimize Android 11 for its phones, low end devices to flagship devices.
Dear Samsung Member,
Greetings from Samsung Customer Support!
To resolve your device hanging issue please visit this link: https://www.samsung.com/in/support/mobile-devices/how-to-restart-the-device-when-freezed-or-hanged/
For further assistance, register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Error report/Ask questions).
Thank you for writing to Samsung.
Samsung Customer Support