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We had the same issue. Unplug your tv and press the on/off button on the tv, hold it in for 10 seconds while the tv is unplugged. Then wait 20 seconds more and plug the tv back in and turn it back on. This solved the problem for us.

If you want the whole story, read this: https://www.avforums.com/threads/lg-43uj630v-audio-output-delay-gets-worse-the-longer-tv-is-on-arc-digital-optical.2138124/ Otherwise, here's the relatively short and sweet version: I bought an LG 43UJ630V and a Samsung HW-K450 2 weeks ago. When connected to the soundbar (either digital optical or HDMI ARC), they are in sync. When left on for around 2 hours though, I'll start noticing the lips are not correctly syncing up with the words. By the 3-4 hour mark being left on, it's atrocious. I expect to have to have to set the av sync initially, but changing it every hour as it slowly drifts out of sync - this is clearly a technical fault. When I plug the soundbar directly into my Sky box (set-top box) there are no issues of drifting audio sync. Changing settings, updating firmware, using different wires, nothing makes a jot of difference unfortunately. I determined the problem was with the processing of the digital output audio signal in the TV's internals. I returned my TV for a replacement, and bought a new sound bar to go with it - an LG SH4D 2.1 - figuring that the samsung soundbar may have been incompatible. Yesterday I set it all up, but found after 3-4 hours of being left on, the audio was wildly out of sync again. https://youtu.be/hmH5jsu20AQ In this example I set the audio so it would output via digital output and internal speakers. The latency between the 2 is so bad you can't even call it echo. This demonstrates how badly out of sync the soundbar output gets compared to the internal speaker. Remember - this is my second 43UJ630V and a different soundbar, and yet the problem returned in exactly the same way. After recording that video I tried connecting my Samsung soundbar instead and it was exactly the same. There is clearly a fault with this model or the entire UJ630V range. I hope it can be fixed in a firmware update. Ignoring momentarily the fault, and the countless hours and stress this has caused - I rather like this model. I'd prefer to fix it instead of sending it back for a refund. I don't understand why I cannot find anyone else reporting the same problems. When I spoke to LG a week ago describing the problem, they told me a fault like this hadn't been reported before... But I've proven beyond a doubt that the problem is there, and probably afflicts a great number of people. I've emailed LG but I'm sure they'll just fob me off again. I plan to give them a ring later, but again, I'm not sure what good this will do. I've diagnosed the problem, and I cannot be the only one experiencing this problem. It is probably addressable in a firmware update if I can bring it LG's attention. Any help or suggestions would be appreciated.