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I have an issue with Walkman on my Xperia P after JB update, when i'm listening to my music some songs skip for a second, it happens very often, it's not always on the same song or same time, it just happens randomly, is starting to get annoying.
try this
settings > apps > all > walkman > clear everything > restart your phone and check again.
will this erase album arts or something?
it might delete album info