Problem with new Galaxy S7, ringtone choice not saving?!

[1945JE]

Hi,
Anyone recognise my problem...any choice I make from the Ringtone choice menu in Sounds is not saving. It defaults every time back to the original, Over the Horizon. Annoying yes, major problem not really but I don't like the default :-/. Is this problem a software bug, and/or fixable?
Thanks in hopes and in advance...:'(

 

[AxlMyk]

Mine does it for some of my contacts. Strange.