We are sorry to hear about your experience with the recent updates on your Samsung Galaxy S21 having issues with Modes and Routines not working, and we apologize for the inconvenience it caused you.
You may submit an error report through the Samsung Members app as follows:
Step 1. Long press Samsung Members icon on Apps screen and tap Error reports.
Step 2. Tap OK on agreement popup to send system log data.
Step 3. Select Symptom category "Settings/System".
Step 4. Describe the problem in details and SEND.
For more assistance and guidance, you may contact us via our online Samsung Customer Care support channels below.