FTP problem with nginx

Hello my server is getting almost 1000-1500 hit per hour
i am not able to login to server via FTP in peak hours
but i can easily login in early morning ( users are minimum in morning )
And aslo i am able to login within just few minutes after restarting nginx

i am using ngninx as reserver proxy server with apache
16 gb ram
and quad core processor
help me please

 

 

 

 

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