My website store.pmfias.com is either slow or unresponsive on Airtel ISP and Airtel Networks (India). My other website www(dot)pmfias(dot)com hosted on the same server is working fine.
The domain pmfias.com is registered on Godaddy, and I am using Cloudflare for DNS routing and as CDN.
My question is, could the issue have anything to do with DNS?
Is the ISP (Airtel ISP and Airtel Networks) blocking my server IP? But how come www(dot)pmfias(dot)com is working but store(dot)pmfias(dot)com has the issue?