Rest API encountered error

Is there any chance that this theme might be the reason of rest api error ?
I’m using shop isle theme and sad to say is not premium but i have plans to make it premium just to clarify is there any chance that this might be the reason?
When i integrated it with the cloudfront the website got broke up the icons is lost and the image slider had been erased . thats the scenarion and after that i see rest api error in my site health .
could someone lend a hand to solve this issue thanks.
the errors is shown below:
The REST API request failed due to an error.
Error: [] cURL error 28: Connection timed out after 10000 milliseconds
The loopback request to your site failed, this means features relying on them are not currently working as expected.
Error: [] cURL error 28: Connection timed out after 10000 milliseconds