Does anyone else experience issues where video and audio fall out of sync after about 3-5 minutes of watching shows from Netflix?

It's only when watching programmes where the audio stream is in 5.1 and if you change it to just English (no 5.1) it works absolutely fine.

I have no need for 5.1 as don't have 5.1 speakers so would like to have it default to without 5.1 but after searching it appears this can't be done. Any ideas why this might be happening?