Plugins Keep Getting Deactivated

On http://www.mattjennings.net/ all of my plugins keep on randomly getting deactivated when I don’t want them to. How can I ensure that my WP plugins will always be activated unless I manually deactivate them?

I’m running WP 4.0.1 and below are the plugins I have installed and had to manually activate myself again:

Akismet
Autoptimize
Block Bad Queries (BBQ)
Crayon Syntax Highlighter
Error Log Dashboard Widget
Exclude Pages from Navigation
Google XML Sitemaps
Hotfix
Media Vault
Obfuscate E-mail
Plugin Organizer
Remove query strings from static resources
Ultimate Category Excluder
Unattach and Re-attach Media Attachments
UpdraftPlus – Backup/Restore
Use Google Libraries
Wordfence Security
WordPress Importer
WP Super Cache – Clear all cache
WP Super Cache

When I go to my Dashboard the Error Log Dashboard Widget Plugin displays a “No errors found” message.

I configured the paid UpdraftPlus plugin (https://wordpress.org/plugins/updraftplus/) to backup all files on http://www.mattjennings.net/, including the MySQL database, to another directory on my DreamHost (http://www.dreamhost.com/) shared server every night and whenever I upgrade plugins.

I purchased the full version of UpdraftPlus Premium package (https://updraftplus.com/shop/updraftplus-premium/) and the plugin developer to assist yet he said his plugin couldn’t have caused the problem.

Any help would be appreciated.

Thanks!