Installed WP multisite by adding wildcard subdomains through cPanel successfully. Also, added a sub-domain site and was able to successfully access it, both dashboard and front-end.
But, when I tried to access it the next day, it is showing as 'Page Not Found'. I am even unable to access the dashboard also.
Through my WP Network Admin, I can see my sub-sites, but only main site is accessible, all sub-domain sites are showing 'Not Found' page.