I've never had this experience. Could it be that because you enjoy the music so much you've maxed out the volume and your amp is clipping?
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It is probably due to the musicians' bowing on their instruments, if it's what I think you're talking about. Surprising that it comes through so well on a recording, as you rarely can get that effect on record, but live it is very noticeable and you're right, this piece seems to show it up in virtually every version I have as well. Almost like a grunt from the orchestra. The musicians have to dig in for the climax, and its physical effect is to cause an audible noise apart from the music.