Can't access product/services in client area

[singcang]

Hello

my WHMCS can't access link : domain.com/clientarea.php?action=productdetails&id=1234 .

Some clients have report for me, and I go to Login as Owner and get same problem.

please check the attach file , page load forever, while the page loads, i also can't load the pages in admin panel, for example: https://domain.com/clients/admin/clientssummary.php?userid=1020 , then i turned off the https://domain.com/clients/clientarea.php?action=services page and waited for about 1 minute, the admin panel pages loaded normally again.

* This problem occurs only some customers (either new or old).
*product or service : is the same, but only some customers have this problem.

I have enabled Displaying PHP Errors but don't show anything.

This is my hearth status :

Quote

WHMCS Health Check
================================================================================

error:
 * One or more sensitive directories are accessible from the web:
    - /vendor
   Please refer to our Further Security Steps for information.

warning:
 * Your web server was detected as "nginx". WHMCS System Environment Guidelines
   recommends using a webserver that by default honors .htaccess files, such as
   Apache. When using an alternative web server, additional security hardening
   steps may be required. Learn More
 * We have detected that your WHMCS installation is currently using the default
   template names for one or more of the active templates. If you have made any
   customisations, we strongly recommend creating a custom template directory to
   avoid losing your customisations the next time you upgrade.You are currently
   using a default template in the following locations:
    - Cart
   Please review our documentation on making a custom theme for help doing this.
 * The following PHP extensions are recommended for best performance and trouble
   free operation. While optional for core WHMCS functionality, certain modules
   and addons may require them to fully function as intended:
    - xmlrpc
   Please review the current system recommendations and search our documentation
   for the specific modules you use to learn more.
 * Customising the default directory paths for some parts of WHMCS makes it more
   difficult for malicious users to find them. Your installation is currently
   using the following default paths:
    - downloads
    - attachments
   Please refer to our Further Security Steps for information on how to change
   these.

notice:
 * PHP session support is enabled.Session autostart is disabled.The PHP session
   save path /var/lib/php/session is writable. 
 * 
    - Your environment appears to meet the minimum requirements for Automatic
   Updates. To update, you will need to ensure you have at least 250MB of
   available disk space.
   
 * You are running MariaDB version 10.3.20. This version supports all features
   required for full compatibility with WHMCS.
 * A verified SSL certificate was detected for your site.
 * cURL reports that it does support Secure TLS 1.1 and 1.2
 * cURL reports that it does support SSL
 * You currently have version 7.78.0 of cURL installed. This version uses a
   secure cipher list.
 * Your PHP environment uses a valid timezone.
 * Your PHP memory_limit value 444M meets the recommended value of 128M.
 * Your PHP installation has all required functions enabled for WHMCS to
   operate.
 * Your permissions are appropriately restrictive.
 * Your PHP installation has all extensions loaded and enabled required for
   WHMCS to operate.
 * Your system is setup to not log unnecessary error levels.
 * Your system is not currently set to display errors.
 * Your PHP version 7.4.22 is supported by WHMCS. Your PHP version is actively
   supported by PHP for both bug fix and security releases.
 * The system cron has completed successfully within the last 24 hours.
 * The timezone used by the WHMCS cron script and the UI match.
 * Your SMTP settings are using encryption to ensure that sensitive data in
   email cannot be leaked in transit to your mail transport agent.

   

and my server is normal, only 30% capacity!

 

Please help!