This is kinda a big problem for me as i dont have a bluetooth headset on me all the time or something. Ive noticed online that there are a lot of people having the same problem as me. They say that the notification sound is coming from just one speaker and thats why it sounds so low and so "sluggish". Ive been reading posts from May and i cant believe there's no fix for this as it is clearly a software issue. Are you gonna adress this issue soon ? Believe it or not for me thats a reason to return my new S9 asap.