The real question is, what is the error. More importantly at what point does the error occur? Is it sever based? Sharpendy hasn't exactly been reliable so it's hard to tell. Though both my resets have occurred after 5-6 hours of listening. If it happens again I'll note all the information I can about it.
From what I've seen. It looks like the game is getting an internal error at some point. From there the data becomes corrupt and obviously with corrupt data it will read as your first time and delete whatever misc data is there.
Dutch that happens pretty often; I've been reset at level 117 before. And on several occasions my playlists have vanished. Try setting the amount of data the game can save on your computer to unlimited. Right Click > Data
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