SSL OCSP_basic_verify() failed

Month ago I buy new https certificate from commodo.
Everything went OK, I updated with help of this tutorial from @deltahf
Certificate installed, all seems OK.

---

But something is wrong. My log is full of this:

Code:

tail -10 /usr/local/nginx/logs/error.log
2018/09/27 22:55:28 [error] 7745#7745: OCSP_basic_verify() failed (SSL: error:27069076:OCSP routines:OCSP_basic_verify:signer certificate not found) while requesting certificate status, responder: ocsp.comodoca.com, peer: 2.17.122.210:80, certificate: "/usr/local/nginx/conf/ssl/pijanitvor.com/ssl-unified.crt"

My pijanitvor.com.ssl.conf (relevant part)

Code:

server {
  listen 443 ssl http2;
  server_name pijanitvor.com www.pijanitvor.com;

  ##  redirect https non-www to https www
      if ($host = 'pijanitvor.com' ) {
         return 301 https://www.pijanitvor.com$request_uri;
      }
 
  ssl_dhparam /usr/local/nginx/conf/ssl/pijanitvor.com/dhparam.pem;
  ssl_certificate      /usr/local/nginx/conf/ssl/pijanitvor.com/ssl-unified.crt;
  ssl_certificate_key  /usr/local/nginx/conf/ssl/pijanitvor.com/pijanitvor.com.key;
  include /usr/local/nginx/conf/ssl_include.conf;

  # mozilla recommended
  ssl_ciphers TLS13-AES-128-GCM-SHA256:TLS13-AES-256-GCM-SHA384:TLS13-CHACHA20-POLY1305-SHA256:TLS13-AES-128-CCM-8-SHA256:TLS13-AES-128-CCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!DSS;
  ssl_prefer_server_ciphers   on;
  #######################add_header Alternate-Protocol  443:npn-spdy/3;
  #add_header Strict-Transport-Security "max-age=31536000; includeSubdomains;";
  #add_header  X-Content-Type-Options "nosniff";
  #add_header X-Frame-Options DENY;
  #######################spdy_headers_comp 5;
  ssl_buffer_size 1400;
  ssl_session_tickets on;
 
  #enable ocsp stapling
  resolver 8.8.8.8 8.8.4.4 valid=10m;
  resolver_timeout 10s;
  ssl_stapling on;
  ssl_stapling_verify on;
  ssl_trusted_certificate /usr/local/nginx/conf/ssl/pijanitvor.com/ssl-trusted.crt; 

What can I do?

 

Seems now it is OK.
I am not using boring SSL
I download new www_domain.com.ca-bundle (it is same as old), and did concatenation again, but not:
cat www_domain_com.crt www_domain.com.ca-bundle > ssl-unified.crt

because my ca-bundle file is:
www_domain_com.ca-bundle

 

What do you mean?
Somethings = sometimes?