Issue WordPress Errors and Redirects

[admark]

Im running the latest version of Plesk on Digital Ocean with the latest version of PHP FPM served by Apache.

I have added a domain and installed WordPress (through Plesk).

I get the following errors with it:

1. Randomly I will be in the WordPress admin and when I click on a link the page goes white with just the text "File not found."

If I refresh, the page works again. This happens a lot.

2. When browsing the site, one or more of the css/js/images will fail to load with a ERR_ABORTED 404 error in the console. If I refresh, it goes back to working.

3. Randomly I will get this added onto the url - login_up.php?success_redirect_url=https%3A%2F%2FMYDOMAIN.COM%2F

The htaccess file has this in it (As do a bunch of the other websites hosted through my Plesk install that all seem to work fine, although I think they were installed via a duplicator backup):
# BEGIN WordPress

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

 

[Royb10]

Same issue exactly on my websites. I host on Google Cloud.
I tried to diagnose the issue in many ways, but without success. The issue is repeated on the new sites on my server.

Sites from few months ago were not damaged.

 

[sebgonzes]

What appear in error_log website in these case? Do you use some cache system?

 

[Edu Membrillas]

Same problem here. Any Solution?