Spent a lot of money to upgrade from a perfectly serviceable S8 edge to an S21 ultra. Bluetooth continually stops audio uncommanded moving a volume key restores sound for 10 or so seconds and then drops out again. Seems to be a known problem on Internet but when will samsung fix this issue that makes listening to music or phone calls over Bluetooth and hence hands free useless.
It didn't do this when I first had it. Suspect 1 of the many updates in the last month.