Cache refreshing too-often

I’m using Super Cache to heavily cache a site (for over a week) and then preload pages every 3 days. But for some weird reason it refreshes the cache every 1 minute and 30 seconds (or there about) and I cannot suss out why.

Only seen this happen in version 1.4.

https://gist.github.com/WolfieZero/8916373
That’s my wp-cache-config.php file if it’s any help.

Thanks!

https://wordpress.org/plugins/wp-super-cache/