No data received

I’ve got a “No data received” with this theme only. All my other word press website are working dine. I have search on web and find no real solution to this problem. Sometimes its working well and sometimes not.

Could you please help me with that. Website is:

Hello there,

I would like to apologize in advance for the delayed respond. Does the issue always to happen on all networks or browsers?

Does the “No data received” issue happen on both the front-end and WP admin sides?