W3 not caching whole page.

Have a problem with W3 caching.
Some pages not cached properly for not-logged users.
Refreshing of page gives sometimes blank screen sometimes part of html.
If turn off page caching – all will shows ok.
So, it’s possible saves only part of page.

CPU usage is ~ 5 %
memory is free only 0,5GB, from 4GB

And ss there some way to debug errors?

https://www.ads-software.com/plugins/w3-total-cache/