Cache is deleting too often

I can´t find out why this is happening, I disabled preload, and also tried to set cache timeout to 86400 seconds and scheduled it once a week at midnight.

But the cache is deleting itself probably every two hours I can´t find out why, there are not too much visitors on site, so there is huge possibility that person, who visit the site will see uncached version almost everytime. That doesn´t make sense to have cache then.

Thank you.