Ringtones mp3 issue
i've found and solve a ringtones issue on tuttoandroid.net forum, so i want to share this with anyone;
NOTE: despite the old nexus4, the nexus 5 does not like mp3 files; copy in the folder RINGTONES/ALARMS only .ogg files if you don't want to lose 1/10 call!
You can check this issue by copying an mp3 file and trying to tapping continously on preview in the list of ringtones to ear: mp3 will fail preview sometimes, despite .ogg files won't ever fail.
Try to convert your mp3 --> .ogg online of by some audio-converter
I hope give you help with anyone