After reviewing this, it looks like there might be a firewall from the server side that is preventing our servers to connect with yours.
The wpml: cURL error 28: Operation timed out after 45009 milliseconds with 0 bytes received points to an overall slowdown, however, with the failing checks it points to a possible firewall blocking.
If possible, please verify that the firewall is not blocking and contact your hosting provider and ask them to whitelist the following domains:
