deleting cached images too often?
Using Jamroom
This is normal. Every hour, images that have not been accessed in over 2 days are removed. This allows the module to work on a small amounts of file deletions instead of "saving up" and having to delete a huge chunk of images once per day (which impacts the system more). By doing it hourly it spreads that work out over the entire 24 hours, as well as clears up space as soon as it can.
Let me know if that helps.