I'm having a 502 error with my website frequently

Goo search console shows me about 200 links in my website with error 502, and When I try to POST something to my website it shows me the 502 error 60% of times.

This problem just started to show after switching the nameservers to Cloudflare’s.

I tried to contact the hosting support twice, They advised me once to clear the cache, and today they changed some settings in the apache but the problem is still there.

The problem shows about 50% of times when I have a strong connection, and increases to 70-80% when the connection is weak.

I have a wordpress website, and I tried to disable all security and unnecessary plugins but the problem still there. my website is land4movies.com

How can I solve this problem?

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