daijinara I think that the ERR_CACHE_READ_FAILURE is something about plugins or other tools on your system that is deleting the temp files. If you were to do a SHIFT + F5 (on windows) or CMD + SHIFT + R (on macos) then it should tell the browser to force download the files again and ignore your local cache.

There are some applications that will clear out temp files and your browser database did not get not of these changes.

I wonder if whatever thing that is causing your temp files to be cleared out is related to a long expiration life. Honestly, I don't know if there is anything to be done on the server side as this is getting served from CloudFlare's cache.