I have the same problem with Google Music. Would love how to stop it. Unfortunately, I don't have the answer to your problem. I am not having the problem with s voice.
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I too picked up the S4 from Verizon yesterday and came from the Fascinate. Big change and I am slowly getting used to the udpates. Very happy with the decission to get this phone.
Plans are to upgrade to this phone from my Galaxy S. I know it is way outdated but my contract just ran out. Waiting to see what the selling price is going to be for the S4. Looking forward to upgrading to this phone and getting away from the constant lag I have on the S.