Irregular wordpress critical error [error in cURL.php line 150]

Errors like this are logged. Check the error log on your server. If you can’t find the log, please contact your host.

Meantime, enable wp_debug and wp_debug_log and after an error, look at wp-content/debug.log to see if anything gets logged there. https://wordpress.org/support/article/debugging-in-wordpress/

You can also try this: Please attempt to disable all plugins, and use one of the default (Twenty*) themes. If the problem goes away, enable them one by one to identify the source of your troubles.

If you cannot access wp-admin, there are other ways to deactivate plugins.

Right. Now do the plugins and theme thing.

Perhaps this is a hosting thing? Please ask your hosts if they’re interrupting attempts to use cURL.

Hmmm… see https://stackoverflow.com/questions/65663752/wordpress-curlopt-ssl-verifyhost-turned-off