SOURCE: Hi there, I have a SamsungGT-B7330.Suddenly, I
Sounds like a defective sound card, I would try to restart again and then perform a factory reset on your phone.
To perform a factory reset its usually inside the phones settings, make sure to backup your contact info and any other information you would like to save.
worst case scenario take your device into the dealer, they will perform a factory reset and if the device continues to be broken will likely replace the phone.
Good Luck!
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