Serious sounds problems

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hi friends ,j got a big problem! Sometimes my Artemis doesn't reproduce sounds! j can hear only the phone calls. No music, no system sounds,no hands free calls were performed. J tried to make either soft and hard reset but the problem was the same! But j noticed that removing the battery for 5 or more hours the sounds returns, but only for few hours. Then sounds disappear again! Is there someone who have the same problem or suggest me the solution, because j change my TIM italian original rom whith a B&B rom and j think my guarantee become no more useful if j'd like to repair it!
Thanks !
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