Sounds are suddenluy default and can't find my tones

hi
i got the LG G2 5.0.2 android stock version.
i got a messege on whatsapp and it was not my ringtone.
i checked it, and all the sounds on my phone switched to LG sounds.

the problem is that when i try to look for my own rigtones
they are not appearing on the list!!
they still at the same right place (media-audio-notification)
i tried to look by file mangar and there are all there!
when i open instagram - he didn't show me my photo gallery
so somehow the phone can't connect to my files
i tried to restart him but nothing happend.

hope u guys can help me..