A new update for Premiere came out today, and it's a small one but a much-needed one that was causing issues for lots of people. This update fixes the deleting cache problem that was introduced with the feature to audio delete the cache after an X number of days. The problem was that it was deleting cache all the time for some users. In some cases even deleting original media, YIKES!
It's a good thing they got to the bottom it fast but as the quote above says I would keep your media and your cache separate. Luckily for me this is the reason I never had an issue with this bug.