Moved hosts, all works except audio downloads - sound is jumpy/corrupted

[slsmithVN]

We just successfully moved our prestashop from one hosting company to another. As far as I can tell, everything is working fine in the shop on the new server. However, we're having trouble with the downloadable products that are audio files. The files download as expected, but when you listen to them, they are jittery/jumpy sounding, as if the file might have somehow become corrupted.

I've tried uploading and overwriting an existing downloadable product file, and this corrected the problem for this product. However we have dozens of downloadable audio files - is there some way we can fix the sound problem for these files without having to re-upload every single product download file?

Thanks!