Quicken File Size when Quicken Opened vs. when Quicken is closed

I have been having some download problems from my credit union which caused me to call Quicken Support. They believe my Quicken file has been corrupted for certain accounts. Since I have decades of data in my Quicken file they also believe that could be the root cause of the corruption. Looking at the size of my Quicken file it was showing in finder as being 239MB. This was when Quicken was opened. However, if I close out of Quicken the file size is 87MB. This seems rather odd. I was wondering what others see regarding their Quicken File size and if there is large difference when Quicken is opened versus when it is closed.
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