Sounds like an issue with Vegas.
The contents of a WAV file must be properly aligned. Otherwise you get garbage/static, or the channels flip.
The format of a 2 channel WAV file is a series of samples, LEFT and then RIGHT. If you lose one whole sample, the 'stereo' of the channels will flip at that point:
left right
left right
left left
right left
right left
If you lose some portion of a sample, say 8 bits, then you have a sample that is only partial. Much like the left-right example, the remaining data gets assembled incorrectly, producing static.
The first question is how this happened, and can you recover the original audio without error (it sounds like the original data is intact).
If not, then you fix it by deleting the partial sample at the start of the static. When you stumble on the right combination, mostly by trial and error, the portion of the audio that was static will once again look like a normal wave form.