LG tv and soundbar out of sync

[Finwhale]

I'll post this here in the first instance just in case it is a sky issue not tv/soundbar. I have an LG tv with connected soundbar connected via optical cable. Quite often I notice the speech is not correctly syncing with the tv and soundbar I turn off sky Q and it's ok but it's not long before they go out of since again, over never had this in 50 yrs of tv ownership. Is this a Sky issue or more likely tv/soundbar incompatibility issue. Thank you