I set my volume in settings supposed be silent except media sometimes they reset back so I hear notifications which I don't like at work my boss gets upset why are my settings reset itself
as per changes in the setting by itself.... please check if you have any routines set.
Bixby routine, or other smart assistant features that changes setting depending on location or time.
also check what your do not disturb settings are, whether it goes against your desired settings.
If you don't have any of these settings setup, and it's still changing the settings... then submit the error report to Samsung Members app post occurrence of issue (within 30min of occurrence minimum).