I am having just about the same issue with my new Q90T. I am seeing audio sync issues when watching live TV with my cable set top box and when watching live over the air TV with the HDHomerun hardware antenna receiver and it's app on my Roku. Nextfilx movies don't seem to have the issue on my TV. For me it seems live television is where the problem is occurring. This is very dissapointing. I have update the firmware on all devices and tinkered with all settings but can't seem to resolve this issue. My cable box is the new Verizon Fios TV One. I have tried all output resolutions on this box and my Roku inculding all of the UHD and HD resolutions. I hope someone can give us the solution. I may have to return this set and get a non Samsung TV. I have recently retuned the Samsung TU 8000 because I discovered it was not a direct replacement model for the previous MU 8000 like one would expect and was not as good as the MU 8000.
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