Error 502 when my host is UP

When i set cloudflare ns some times my site cant reach and show error 502… for solve that i contact my hosting and they say evrything is ok so i change my domain ns to my host ns and test some days and i dont have any down time! yesteday i change ns to cloudflare and now my site get error 502… why this happen?

Does this happen often? A 502 error comes from the host and is usually temporary.

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