Lightroom 5.6 Keeps Deleting Standard Image Previews, Constantly have to regenerate, why?

Hello, I constantly have to regenerate standard sized previews in Lightroom 5.6. This was also the case with the previous version 5.5. I'm not sure what's going on as all settings seem to be in check.
I'm using a late 2013 Macbook Pro 2.6 GHz Intel Core i7, 16GB Memory running OSX 10.9.4. I've set aside 20.0GB for the Raw Cache, 10.0GB for video. Cache is located at Library/Caches/Adobe Camera Raw, which I believe is the default location. The preview cache is 2GB in size. I generate high quality 2880 sized previews. LR is set to automatically discard 1:1 previews after 30 days. Tried purging cache but problem still persists.
It's pretty frustrating to have to regenerate standard sized previews every time I open LR. Sometimes I even have to regenerate them during the same session! Does anyone have any help or advice? Thanks!

The Preview files are created for all files that are imported into Lightroom. The files by default are stored in the Lightroom sub-folder which by default is within your My Pictures> Lightroom folder and has an extension .Previews.lrdata see the screen capture.
These previews are used by Lightroom when you are working in the Library Module.
When you are working in the Develop Module, Lightroom utilizes the files in the Camera Raw Cache since it re-renders from Original files every time you make a change and the files in the cache assist with this process. That when you see the "Loading message".

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