Audio issues with bluray ripped to MKV

[yourpalfranc]

I've recently started ripping some of my bluray discs to MKV. My last attempt on a movie resulted in some audio problems. I just used default settings in MakeMKV, Pioneer BDR-XD05 3.10, Windows 10 (latest). It resulted in several .mkv files, as usual. All of them except the full movie file played back perfectly in VLC 3.0.16. However, the full movie file begins with no audio and then starts a buzzing sound that reminds me of a drone in flight. I also tried playing it back with VLC on a mac and it was the same case. Any thoughts? I'm planning to try processing the movie again overnight, but I thought I'd ask the question in this forum to see if there's something I may have missed. My other rips have been perfect??? Thanks, in advance for all assitance!