Getting server threw exception error with Status: 0 | communication failure

We have create one object with 400+ fields and added 30000+ data in this particular object, Now the issue is in grid view, we select 200 in items per page we get the below error

And, I have created one another object and added 400+ data, this is working fine

also I have change some setting in server like:
max_input_vars :2448002
memory_limit :480248M
post_max_size :48024M
max_execution_time :6000
max_input_time :6000

Anyone have idea why getting this error.

In most cases this error is a timeout, your server can’t process the script in the given time, which is usually caused by slow servers. Please check if you meet the system requirements.

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