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This was fixed by spending more money on a hosting plan, so I'm not sure which button to press!
Chrome
OSX 10.13.4
Plugins: Anti-Spam by CleanTalk, Boldgrid Easy SEO, BoldGrid Gallery, BoldGrid Inspirations, Imagify, Post and Page Builder 1.7.4, WP Rocket, WPForms Lite
Customer support service by UserEcho
5 Months ago. Again, upgrading hosting was what actually fixed it.