I have seen hundreds of posts on many other forums with people having this problem. Apps work just fine in any Audio/Video configuration. However, I cannot watch anything I have purchased on iTunes, 4k or HD, without there being a delay. The Audio is behind the video. This happens on several televisions. I have tried new and different HDMI cables, even returned by first 4k box and same issue. My main TV is only 2 weeks old, a 2017 LG OLED that supports Dolby Vision, HDR10 and HGR. I have reset the box, tried Dolby Vision, non Dolby vision, multiple configurations and refresh rates, always the same problem on any Audio/Video settings. Has anyone else had this issue and fixed it? Or have any other suggestions?