Since no one else has mentioned audio problems on Nyaa yet, it could be a load problem with an older computer due to HEVC.  This is very likely the case if the cutouts aren't at the same time during repeat playbacks.  You could try not having any other programs running in the background during playback.  You can also look for options to increase processing priority of your video software in it's options menu, and try another program, like VLC.

You're better off asking on Nyaa's then here this site only mirrors the torrents.