Hi there, i have come on here for exactly the same problem. took a photo of my kids and every day or two it just disappears and goes white. also my ringtone and message sounds change themselves. did you find out why it does it?
yes, what i found out is that this model of phone has a bad connection with the memory card. What i found is that the picture you want as your background and the ring tone you want from a song, if you copy them both onto the phones internal memory it solves the problem.
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