Ошибка 404 Varnish каждые несколько часов

Интересно, может ли кто-нибудь указать мне этим в правильном направлении. Что-то изменилось на моем VPS у моего хостинг-провайдера, и с тех пор многое пошло не так. Одна из таких вещей - Varnish - мне пришлось перестроить всю конфигурацию лака, и с тех пор каждые несколько часов некоторые из моих сайтов обнаруживают ошибку 404 Forbidden, которая устраняется только перезапуском varnish вручную через SSH. Я прикрепил свою конфигурацию ниже. Если бы кто-то мог мне помочь, это было бы здорово. Сейчас я действительно начинаю выдергивать волосы!

backend default {
  .host = "publicIP";
  .port = "8080";
}




acl purge { "localhost"; "127.0.0.1"; "publicIP";}

sub vcl_recv {



# IP forwarding.
if (req.restarts == 0) {
if (req.http.x-forwarded-for) {
set req.http.X-Forwarded-For = req.http.X-Forwarded-For + ", " + client.ip;
} else {
set req.http.X-Forwarded-For = client.ip;
}
}


# Don't serve cached pages to logged in users
    if ( req.http.cookie ~ "wordpress_logged_in" || req.url ~ "vaultpress=true" ) {
        return( pass );
    }   




    if (req.request == "PURGE") {
    if (!client.ip ~ purge) {
    error 405 "Not allowed.";
    }
    return (lookup);
    }



#set req.grace = 60m;
if (req.request != "GET" && req.request != "HEAD" && req.request != "PUT" && req.request != "POST" && req.request != "TRACE" && req.request != "OPTIONS" && req.request != "DELETE") { 
 return (pipe); } 
if (req.request != "GET" && req.request != "HEAD") { 
 return (pass); } 
#if (req.http.Authorization || req.http.Cookie) { 
#return (pass); } 
return (lookup); 
# Set X-Forwarded-For header for logging in nginx
remove req.http.X-Forwarded-For;
set req.http.X-Forwarded-For = client.ip;

# Remove has_js and CloudFlare/Google Analytics __* cookies and statcounter is_unique
set req.http.Cookie = regsuball(req.http.Cookie, "(^|;\s*)(_[_a-z]+|has_js|is_unique)=[^;]*", "");
# Remove a ";" prefix, if present.
set req.http.Cookie = regsub(req.http.Cookie, "^;\s*", "");

# Either the admin pages or the login
if (req.url ~ "/wp-(login|admin|cron|cart|my-account|checkout|addons|administrator)") {
# Don't cache, pass to backend
return (pass);
}
if (req.url ~ "/administrator") {
  return (pass);
} 
if ( req.url ~ "\?add-to-cart=" ) {
 return (pass);
}
if (req.url ~ "/(contact-us|contact|get-a-quote|upload-files|competition)")
{
return(pass);
}
# Never cache PUT, PATCH, DELETE or POST requests 
#if (req.method == "PUT" || req.method == "PATCH" || req.method == "DELETE" || req.method == "POST") { 
#return (pass);
#} 
# Remove the wp-settings-1 cookie
set req.http.Cookie = regsuball(req.http.Cookie, "wp-settings-1=[^;]+(; )?", "");

# Remove the wp-settings-time-1 cookie
set req.http.Cookie = regsuball(req.http.Cookie, 
"wp-settings-time-1=[^;]+(; )?", "");

# Remove the wp test cookie
set req.http.Cookie = regsuball(req.http.Cookie, 
"wordpress_test_cookie=[^;]+(;)?", "");

# Static content unique to the theme can be cached (so no user uploaded images)
# The reason I don't take the wp-content/uploads is because of cache size on bigger blogs
# that would fill up with all those files getting pushed into cache
if (req.url ~ "lib/themes/" && req.url ~ 
"\.(css|js|png|gif|jp(e)?g)") {
unset req.http.cookie;
}

# Even if no cookies are present, I don't want my "uploads" to be cached due to their potential size
if (req.url ~ "/lib/uploads/") {
return (pass);
}

# any pages with captchas need to be excluded
if (req.url ~ "^/contact/" || req.url ~ "^/links/domains-for-sale/")
{
return(pass);
}

# Check the cookies for wordpress-specific items
if (req.http.Cookie ~ "wordpress_" || req.http.Cookie ~ "comment_") {
# A wordpress specific cookie has been set
return (pass);
}

# allow PURGE from localhost
if (req.request == "PURGE") {
if (!client.ip ~ purge) {
error 405 "Not allowed.";
}
return (lookup);
}

# Force lookup if the request is a no-cache request from the client
if (req.http.Cache-Control ~ "no-cache") {
return (pass);
}

# Try a cache-lookup
return (lookup);

}

sub vcl_fetch {
#set obj.grace = 5m;
#set beresp.grace = 60m;

   set beresp.http.Vary = "Accept-Encoding";
# Images
if (req.url ~ "\.(jpg|jpeg|png|gif|ico|tiff|tif|bmp|ppm|pgm|xcf|psd|webp|svg)") {
  unset beresp.http.cookie;
  set beresp.http.cache-control = "max-age=2592000";
  return (hit_for_pass);
}

if (!(req.url ~ "wp-(login|admin|cron|cart|my-account|checkout|addons|administrator)")) {
    set beresp.ttl = 6h;
    set beresp.http.cache-control = "max-age=1800, must-revalidate";
}








}

sub vcl_hit {
if (req.request == "PURGE") {
purge;
error 200 "Purged.";
}
}

sub vcl_miss {
if (req.request == "PURGE") {
purge;
error 200 "Purged.";
}
}


sub vcl_deliver {
# multi-server webfarm? set a variable here so you can check
# the headers to see which frontend served the request
#   set resp.http.X-Server = "server-01";
   if (obj.hits > 0) {
     set resp.http.X-Cache = "HIT";
   } else {
     set resp.http.X-Cache = "MISS";
   }

     if (resp.http.magicmarker) {
                        /* Remove the magic marker */
                        unset resp.http.magicmarker;

                        /* By definition we have a fresh object */
                        set resp.http.age = "0";
                }

}