Try navigating to Settings -> Sound -> volume then turn up the Notification volume. See if that works for you. Also make sure you don't have an app that is turning down the sound.
you know i do have the same issue. but i do believe its the messaging app that i use. i use chomp. i got tired of it doing that so what i did was turned off the notification in the chomp app and turn the notification on in the basic messaging app. and i didn't have a problem with it again. might not be your issue but it worked 4 me.
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