To help with sound sync issues. if the video settings are set to Automatic try changing them to 1080i, and to 4K when wanting to play UHD content..
For Sound issues go to Setting > Audio & Video > Audio Output > have yuo tried setting it to Follow Content?
Netflix should always use Follow Content. Also, use 'Follow Content' for any bitstream audio like Atmos where it's available on content.
Have you tried connecting the 360 to a TV HDMI port without ARC, 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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