hi guys,
i had the same problem and was looking everywhere for a solution.
i think i find one that works, you guys can try it and see if it works for you as well.
PS. this may also have worked because of the recent update MS rolled out, so you might need to update your computer if you havent.
here is the video, https://www.youtube.com/watch?v=vaWRs9TmeVg
and i just did the first method they did and it worked for me.
when i checked my sound devices, one of them had an alert box beside it and after i updated that, i haven't experienced anymore de-sync whenever i watch 40 minute podcasts.
i do try to keep a close eye on the videos to see if there is still any, but so far it has been good!
hope this helps!