You have a trusted certificate installed, you can ignore wherever you saw that
See:
WordPress may be trying to run a bunch of background tasks, which can also trigger it. Disable auto-updates, and any cron tasks you created.
Also, note that bot visits (Including crawlers like Google) also influence this.
WordPress is created in PHP, so you have a ton of PHP files. This note is more for people who custom-coded, and does not apply to you.
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