Site is getting 520, but can see page if I refresh several times

Hi
https://poolsure.com/ is getting 520.
But I can see the page if I refresh several times.(about 5 times)
I’ve tried to change CF settings yesterday, but issue was not fixed.
When I check the site at 1AM est today, site was working.
But now it’s not working, too.
Could you please help me with this issue?

I had this problem over the weekend. Hosting with GoDaddy. GoDaddy fixed it around 7pm yesterday for my site, but the problem returned about an hour ago. GoDaddy’s servers apparently do not play well with Cloudflare.

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