Sorry if this has been addressed elsewhere, but I couldn't find anything. I connect my DX to my PC via USB Mass Storage to easily transfer pictures/music/icons, etc. to my phone. However, once I disconnect from my PC, some of my custom ringtones "reset" to one of the simple rings, and when I go to look at what ringtone is assigned, it just says "Unknown Ringtone". Any idea why this happens or if there is a way to keep it from happening? It's a pain to have to reset all of my ringtones and notification tones every time I have my phone connected to my PC.