For Sound issues go to Setting > Audio & Video - try setting Dolby Audio to always convert. You can also try different settings such as follow content or disabled
If you are using a sound bar try connecting the 360 to a TV HDMI port without ARC.
If you are connected to a HDMI ARC connector on the TV try connecting to a non ARC HDMI connector, using ARC has been a problem for some people.
Also if you are using fibre optic straight from the 360 to your sound bar then set Dolby to Follow Content.
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