Hi, all.

I'm experiencing a very strange issue that has cropped up over the last couple of days.

I'm using c5 (5.7.5.3) to build our company's tech ops knowledge base. I've been adding a lot of procedural documents to the KB recently (around a thousand so far), and in the last 2 days or so, I've seen some of the pages behave differently. Some of them don't load completely, displaying only the Intro page area, or the Intro and a block or two more. Even the toolbar is missing on these pages. If I leave the page and come back (or refresh a few times), the page will display correctly, although the Conversations block at the bottom of the page seems to be stuck.

I've got some styling done in an HTML block in the page template for these pages, and they all have a couple of additional custom blocks built with the Block Designer package that have PHP to display the page owner, last update time, and a note when the page hasn't been updated within a year.

Another page template that also contains these blocks has had the issues, as well, though most others have not had any behavior/display issues. The only other pages that have demonstrated any issues have been some containing Magic Tabs blocks.

My server admin indicates that he's seeing high CPU usage from httpd services, as well as the mysql service.

Has anyone else encountered anything along these lines or have suggestions on things I can try to do to address the issue?

Thanks.