Sudden problem with Amazon Lightsail PLESK instance

Question

I am a Linux beginner, and I have been running PLESK Lightsail instance for 2 years for my organisation's website running WordPress. Yesterday The CPU utilisation suddenly constantly exceeded the Sustainable zone. When looking at the TOP command processes, I saw that the PHP & php-fpm are taking almost 100% CPU. They are not reduced even when I closed ports 80 and 443. I have tried to stop apache and nginx too, but the PHP and php-fpm were still running.

Curiously, the website is still running and accessible.

I also can't login to PLESK, receiving this message after I click submit button:

Server Error
500
Error
Class 'PleskExt\Monitoring\Helper\CloudMonitoring' not found

Type	Error
Message	Class 'PleskExt\Monitoring\Helper\CloudMonitoring' not found
File	CustomButtons.php
Line	49

I tried to use PLESK repair utility but it doesn't seem helping much, after I enter command  "plesk repair all -y" the screen just freeze and I can't do anything with the terminal.

Have any of you experienced this?

Thanks!

Answer

I am not familiar with PLESK.  But whenever I have seen sudden problems with servers where "nothing else changed" it was normally related to finite resources being consumed.  
* Have you checked the disk that is attached to the lightsail instance, is it full?  
* Have you hit a memory constraint?  
* Are you running a database on the instance?  If so, have you hit a max connections limit?

Sudden problem with Amazon Lightsail PLESK instance

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