Post Masonry issue

Hi Tech,

I activated the following :
Post Masonry > Pagination > Infinite Load Event > Button

The button works fine for sometime, then when button is clicked, it disappears and nothing loads.
to fix this issue “Temporary”, I must clear cache or re-save the page.
(the issue dosn’t fix if cache plugin is disabled)

Also I have “WP Cerber” security plugin, when the issue occur, the “WP Cerber” shows:
—
/wp-admin/admin-ajax.php
POST | HTTP 403 Forbidden|
—
If I disabled “WP Cerber security plugin”, this dosn’t fix the issue.

I really love this plugin, any help?

The page I need help with: [log in to see the link]