Music being stored as Other

Recently, whenever i try to put music on my 160GB ipod from itunes, it will say it has synced but when i disconnect my ipod, there will be no music on the ipod but the data will be being stored as Other data instead.



I have found that if i put the music on an artist at a time then disconnect then the music will be on the ipod. But after a while of doing this, it will go back to having no music and all of the music i have tried putting on there being stored under other. This doesn't always happen with the same artist, it varies each time.



I have restored the ipod multiple times to no avail. Has anyone had this problem? And if so have you managed to solve it?



Thanks

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