Small sound dropouts in rendered files

Now that rendering is running without crashes with 64 GB RAM, I do, however, occasionally have minimal sound dropouts in the finished video files. Only a fraction of a second at a time, but annoying.
They are completely irregular and do not coincide with cuts.
In the rendering settings, I only set the interpolation to “best”, otherwise nothing else was changed. Strangely enough, these sound dropouts did not occur with the old RAM. Of course, it’s not the RAM, but I usually only had the interpolation set to “good” or “better” back then. But that has nothing to do with the sound.
Before I try to figure it out (and wouldn’t even know where to start), I’d rather ask here. Maybe there’s a simple explanation?