Share your experience!
First Post so hope I don't mess up 
I've selected a Notification sound for my Z1 (C6903) and it works - once or twice - but then reverts back to "Signature" which is not what i want. I've done this multiple times hoping for a different outcome :smileysmileywink:
This started to happen after the upgrade to 4.4.4.
Hope someone has an answer..
Skewsy
Hi Skewsy39
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By chance is the ring tone a custom ringtone and is it located on the SD card?
Not on the SD card.
I select Altair from the standard available options using Sound Picker.
Within an hour and perhaps 2 notifications, it switches back to Signature.
Try loading the device in to safemode, from here add the ringtone that you want and then try using it for a period of time, if the Ringtone never changes, then this could be third party software that keeps defaulting your notification settings.
Let me know how you get on.