WordPress, plugins, and themes do not normally generate logs.
Depending on your host and how it is set up, there might be general PHP logging. This will ususally be a file with some name like php_logs unde a logging directory setup by the host.
Again, it is unlikely that this is a Weaver or Weaver Plus error. You should direct your efforts into any code or shortodes you are using in your content.
Also, WP sites rarely go dead. Be sure to set WP_DEBUG to true in your wp-config.php file. That allows display of PHP error messags on site.
Then, even a blank site page can have information. Use “Show Page Source” which often displays incmoplete HTML that can show exactly where generated HTML output stops.