500 Internal Server Error

Hello everyone.

I’m having an intermittent 500 Internal Server Error. It only happens in certain conditions, and now I can reproduce it, but don’t know what causes it.

The error happens when I’m editing a heavy blog post on my website and then I open the homepage or other post as a user. If I close the page I’m editing immediately, the 500 internal server error disappears.

– I already switched the theme, it still happens.
– I already deactivated all plugins to see if it was related to them, and it still happens.
– Contacted hosting, and no specific solution.
– Checked the memory limit in php.ini file and changed the settings to huge values (see below), to avoid it being the problem. It still happens.

max_execution_time = 30000
max_input_time = 60000
max_input_vars = 60000
memory_limit = 2048M
post_max_size = 2048M
upload_max_filesize = 2048M

– Used wp-rocket helper plugin to deactivate the rules of htaccess file.
– Reinstalled wordpress.

None of the above actions solved the issue.
Do you have any more ideas?
Is there a way to have a description of this error in a error_log, so I can try to find the corrupted files or the cause for this?
Is there a way to count how many times my users are facing this 500 error? A plugin, a log file?
Can it related to my website having many many photos, so the only option will be to decrease the size of it?

Thanks in advance. I’m not too technical, so please try to answer in a easy way. ??

The page I need help with: [log in to see the link]