Very slow with domain name, but fast on IP address

Hello,

My web (both staging and production) is currently really slow when I open it with domain name, but fast on direct IP address. Here’s the load time comparison:

Domain name: 12-13s
IP address: 3-4s

Usually my web performance is fine using Cloudflare, but sometimes this incident happens (2 months ago and 3 months ago). When it happen, usually it takes about a day before everything go back to normal. I bought SSL from Cloudflare, so when I disable the CF cloud, the website won’t open (page shows certificate issue). What’s causing this and what’s the best practice to prevent this? Do I get SSL from other place and when this happens, I can just detached Cloudflare network for a while until it gets back? If it’s server issue I can reroute it, but this is network issue.

I’m a on “PRO” plan, but when I try to login and contact support, I never get the code that sent to my email to login. I’m stuck now.

I would really appreciate any help.

Thank you.

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