Good day,
tell me how to solve this problem: after I turn on the cache (caching standard Joomla, progressive), after a while lost all materials K2. Also, I have in menu a link to category K2 and when I click on it I see a message that there is no material in the category.
After clearing the cache, they certainly appear again. But without the cache does not.
K2 is a popular component, I do not think that the problem arose only by me.
Tell me how to solve it?
thanks

Surely no one can tell what is wrong?
Joomla latest version: 2.5.9, K2 too version 2.6.5 .
After some time (probably caching) of Article cease to appear on the site.