Davood Dehnavi on "Some plugins randomly deactivating"

My site has recently started randomly deactivating 11 of my 23 plugins without the message waing about being deactivated due to an erro, and without records of errors in either the apache server log or the WordPress error log. It happens anywhere from every 15 minutes to every few hours. I'm not exactly sure when it started, but it was within the last two weeks. Here are two list of the plugins I have running, the first always remain active, the second is the set that is always deactivated:

Ajax Search Lite
Akismet
Disable All WordPress Updates
Event Organiser
Follow
Google Analytics by MonsterInsights
Plugin Organizer
Shortcodes Ultimate
Simple Share Buttons Adder
The Events Calendar
Yoast SEO
WP Super Cache

Advanced Custom Fields
cforms
Constant Contact Plugin for WordPress
GEO my WP
Popups - WordPress Popup
Relevanssi
SI CAPTCHA Anti-Spam
Store Locator Plus
Store Locator Plus :: Pro Pack
WP Document Revisions
WP Publication Archive

Any help appreciated, I'm at a loss of what to try next.