You can change it to 644 when it's bad and then it can't be overwritten with a new one.
Well I finally caught a bad featured member but when I changed
cache/featured member to 644 it still was over written and changed when the cache timed out.
I also tried to change it to 444 but I guess my server will not allow me that permission it just reverts to 644. So I put it back to 666.
