Error 403 Forbidden Error Randomly Occur

Hi All,

The 403 Forbidden error randomly occur in my website. It occur when visitors access our wordpress post. The Error 403 Forbidden will be gone after our visitor refresh the page.

I search aboout this issue and found that several solution such as removing .htaccess. What most likely become cause of this problem? Because it happen randomly and the error gone after the page refresh.

Thanks!