What version of Presenter are you using? I know this was a bug with Presenter 7.0.0, and maybe 7.0.1. I've not heard of it happening since then, but that doesn't mean it can't happen. It may be worth a discussion with Adobe Support about what happened and why Presenter would delete your audio files. You can reach them at 800-945-9120.
As to you other post, I did reply to it, but Presenter's functionality can't be changed. When you publish the presentation the audio files that are created do have a naming convention that associates them with the slide they are on, but in the build phase, it uses some cryptic method that I've never been able to figure out. So, for that reason, as well as a handful of other non-Presenter related reasons, I've taken to just using an Audio recording/editing application to deal with my audio, and then importing to Presenter. This allows me more control over the naming convention, as well as more control over the quality and settings used to record and/or encode the audio. It may seem like more work at first, but I feel like I can get through the audio portion of Presenter faster when I use a tool built for audio. Just remember to save or split your audio into individual files for each slide. Name them sequentially and then you can import them all at once into Presenter by selecting the first slide you wish to import to, browsing to the audio files and selecting them all for import.
I'M using Presenter 9.
But I have that problem since the begining with Presenter 6 I think. When at that time I lost the MP3 for a 85 slides Powerpoint...
Then it is absolutly worth reaching out to Adobe Support about it. If you have had this issue for 6-7 years, and across multiple versions, then I would say you are past due for a resolution. Give support a call, not an email, and have someone start working on what is happening.