CSS missing

Hello.
I have fine tuned LS Cache for my clients’ sites (which are now hosted using Openlitespeed via Runcloud) and it is working as expected, with excellent performance. However there is something that is happening intermittently.

CSS minify and combine is enabled, and JS minify (but not combine) is enabled. The website (an online store) works just as fine, no problems at all, both with logged in and guest users. Then all of a sudden, couple days later, it seems like all cached CSS files are now gone (404 errors) and the website loads without any formatting, requiring me to log on to the admin panel to clear the CSS cache only, which immediately fixes the problem.

I still have no clue on why this happens but I need to find a solution ASAP. This does not seem to happen on every website. Does this have something to do with WP-CRON? Perhaps the LS Cache is clearing those files and not regenerating them. I don’t use any plugins that could be doing any of this, and as stated this does not seem to happen on every website.