Had the phone for a few weeks....had set up some downloaded ringtones to use. They all worked fine til today. I noticed that several of them had reverted to the default tone, and discovered that several (but not all) of the downloaded clips were gone. THey were still listed under RINGTONES, and also still listed under the Samsung Music Player, but they would not play. They appeared to be gone (but still listed). They were all MP3s...I deleted the titles from Ringtones. I downloaded them again, and they work fine now. But...what would have deleted them in the first place? Overnight? Just curious why that would happen....