Alright, thanks for your help!
Hopefully it will be fixed soon.
Sorry, my server security setting wasn’t allow access from outside of Japan.
It should be able you to access the site by now.
I’ve deactivated all plugins except you told me though, I think the issue hasn’t solved.
I’ve changed my theme to parent theme but the issue still exists.
Could you login to my site and support me?
Also some other widgets don’t work too. (Twitter feed widget ..etc.)
I would be very happy to see them and share me how to fix.