Issue nginx caching stops working randomly

[SquanchIt]

Hey guys,

I have noticed that nginx caching suddenly stops working after several hours.

When cache is running the TTFB is at 30-50ms, and when it's not running it's at 1000-3000ms - Byte Check - TTFB Results

Sometimes the problem goes away when I reboot the server and re-enable nginx caching, but it doesn't seem to do the trick this time.

Server details:

• I am running a WordPress site installed by WordPress Toolkit.
• The server is Ubuntu 18 running with 1gb of RAM on Vultr.com VPS
• I installed the server last week
• I have not modified apache or nginx configuration. Everything is set to defaults.
• Ran all the updates
• Only running 1 account / domain

 

[SquanchIt]

Also, keep in mind, I didn't enable WP Super Cache, as I figured it's not needed because nginx cache is replacing it?

Thanks