In addition to everything else mentioned below, I replaced the X1 box, didnt help. The only fix that works is to get out of "expert" mode and select stereo mode. I have two 4-8k Samsung TV's and a Samsung sound bar on one and a Sonos ARC sound bar on the other. Changed out HDMI cables to Quest cinimon 4k/8k cables, re-booted, adjusted sync - all to no avail. Switch to stereo and the lip sync issue resolved. Not the fix I wanted, full 5.1 dolby sound would be nice with lip sync issue corrected Not sure who is working on a fix.
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