Plugin keeps bugging

I really like this plugin, it makes the cases page of my company look great. But I have a big problem.

The plugin keeps going down somehow. Then i have to deactivate the plugin and active it again and it works. But when I check out a portfolio item a couple of hours later it tells me the following: Page is not available. As if the page does not exists!

Really iritating and strange, and I cant figure out whats wrong.

And thats not all. When I install the Jetpack plugin, then somehow the aeolus plugin doesnt show any thumbnails pictures, but only grey placeholders.

Are these known errors?

Can you please help me.

The plugin is installed on the following website: http://www.creativeaction.nl/een-greep-uit-ons-werk/