Lip-sync errors after latest update?

Hello.
I started having lipsync problems a while ago, as I reported in this thread:

But since this seem to be the big delay thread, even though it is old, I post it here as well in the hope I will get a solution.
I bought my 4k+ during the summer sale, so probably have never used any version before 18. Yet sync used to be good and now it is not (Todays setting is .225 ahead on a couple of things I’ve been watching)
Please help me. Once setup is complete, watching stuff needs to be “plugandplay” else your lovely machine turns into something just causing anger