Notification Sounds Issue
Android 6.0 Marshmallow comes with a lot of new features to be excited about. Unfortunately, new releases include bugs and other hiccups. After waiting for the Marshmallow update to be released to my Samsung Galaxy s5, I noticed that my notification sounds were not working for incoming text, etc. Videos would play in my YouTube app, but I missed some text that came in because I did not hear the sound. I checked to make sure that the sound settings for notifications were still set correctly; they were.
I started searching around to see if anyone had the issue. Some people in a forum suggested resetting the phone to factory defaults and not syncing the backed up data to the phone. Several unlucky people tried the suggestion us to find themselves with a squeaky clean phone and no notification sounds.
Searching more, several users reported that doing several reboots corrected their issue. So, since I really did not want to reset my phone (holding out a little longer to upgrade to the new Samsung Galaxy s7 Edge), I rebooted my phone a few times. I rebooted it about 3 or 4 times and BAM! my notification sounds were working again. Thanks to helpmynexusgoogle for the working solution!
So glad I did not have to reset my phone. I hope this will help someone that runs into the same small but annoying issue.