Woocommerce Plugin Bug

The Easyship plug-in for Wordpress/Woocommerce is causing issues with my site and reading through the support section of the plug-in other are experiencing this as well.
https://wordpress.org/plugins/easyship-woocommerce-shipping-rates

Wordpress Site Health check is showing the 4 errors below when Easyship plug-in is turned on.

The REST API request failed due to an error.
Error: [] cURL error 28: Operation timed out after 10001 milliseconds with 0 out of -1 bytes received
The loopback request to your site failed, this means features relying on them are not currently working as expected.
Error: [] cURL error 28: Operation timed out after 10001 milliseconds with 0 out of -1 bytes received
The scheduled event, action_scheduler_run_queue, is late to run. Your site still works, but this may indicate that scheduling posts or automated updates may not work as intended.
Background updates ensure that WordPress can auto-update if a security update is released for the version you are currently using.

When looking through the debug logs I noticed that my error logs are filling up with the following 4 error messages.

PHP Warning: session_start(): Cannot start session when headers already sent in /home/forgetme/public_html/wp-content/plugins/easyship-woocommerce-shipping-rates/easyship.php on line 73
PHP Notice: Undefined index: es_api_key in /home/forgetme/public_html/wp-content/plugins/easyship-woocommerce-shipping-rates/includes/easyship-api.php on line 32
PHP Notice: Undefined index: es_api_secret in /home/forgetme/public_html/wp-content/plugins/easyship-woocommerce-shipping-rates/includes/easyship-api.php on line 33
PHP Notice: Undefined index: es_taxes_duties in /home/forgetme/public_html/wp-content/plugins/easyship-woocommerce-shipping-rates/includes/easyship-api.php on line 36

I like using your product for my shipping needs, but this plug-in doesn't get fixed soon then I"m going to need to start looking for a different shipping partner since this is impact the performance of my Woocommerce site.

Additional info that might be helpful:
WordPress version: 5.3.2
WooCommerce version: 3.9.2
PHP version: 7.3.14