Cache preload questions

Hello, I have my Automatically prime the page cache checked inside of page cache and update interval at 900 seconds and page interval 10.

Garbage collection is at 3600 seconds.

It all works well, but after some time of inactivity on my site, it takes time for the pages to load on the first visit and the files on disk have to be recreated.

How to fix that? It seems like the cache is expiring and until there is no new visit, it does not cache again…

Any suggestions?

Thanks