some resources are not loading for the first time. but ok on refresh

Hi, i think this is a wired problem. when i open up my site for the first time on chrome, some of the resources (image, js, css) are not loaded. from chrome developer console these are the error massage.

Failed to load resource: net::ERR_SPDY_PROTOCOL_ERROR                velocity.min.js
Failed to load resource: net::ERR_SPDY_PROTOCOL_ERROR                add-ons.png 
Failed to load resource: net::ERR_SPDY_PROTOCOL_ERROR                integrations.png 
Failed to load resource: net::ERR_SPDY_PROTOCOL_ERROR                trucking.svg 
Failed to load resource: net::ERR_SPDY_PROTOCOL_ERROR                calculating.png 
Failed to load resource: net::ERR_SPDY_PROTOCOL_ERROR                novo-header-bg.jpg

but right after refreshing the page, its completely fine. also its not like error with the same resources every time i open my site on chrome incognito. sometime, error gives for 17 items, sometime for 8 items randomly. this is happening with my all sites including which are on sub-domain.

im using latest chrome version, deleted chrome entire cache, flush my dns resolver but none helped me. also no error on my server error log. for Firefox everything is fine. this is happening on chrome/desktop

anyone faced the similar issue? im using latest nginx with http2 by the way… and here is my ssl config

        ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
        ssl_prefer_server_ciphers on;
        ssl_ciphers EECDH+CHACHA20:EECDH+AES128:RSA+AES128:EECDH+AES256:RSA+AES256:EECDH+3DES:RSA+3DES:!MD5;
        ssl_ecdh_curve secp384r1;
        ssl_session_cache shared:SSL:10m;
        ssl_session_timeout 60m;
        ssl_session_tickets off;
        ssl_stapling on;
        ssl_stapling_verify on;
        resolver 8.8.8.8 8.8.4.4 valid=300s;
        resolver_timeout 5s;
        add_header Strict-Transport-Security "max-age=15768000; includeSubDomains" always;
        add_header X-Frame-Options SAMEORIGIN;
        add_header X-Content-Type-Options nosniff;

thanks in advance. @jtittle @hansen