Site Health Issues

Hello,

My client has installed this plugin but under Site Health in WordPress, when this plugin is turned on we have 2 critical issues.

1) The REST API encountered an error
The REST API is one way WordPress, and other applications, communicate with the server. One example is the block editor screen, which relies on this to display, and save, your posts and pages.

The REST API request failed due to an error.
Error: [] cURL error 28: Operation timed out after 10001 milliseconds with 0 bytes received

2) Your site could not complete a loopback request
Loopback requests are used to run scheduled events, and are also used by the built-in editors for themes and plugins to verify code stability.

The loopback request to your site failed, this means features relying on them are not currently working as expected.
Error encountered: (0) cURL error 28: Operation timed out after 10001 milliseconds with 0 bytes received

Is anybody else experiencing this?

If I turn the plugin off it resolves the issue straight away.

The site is hosted on Siteground.

Thanks