Issue IIS Hangs and Needs IIS restart

[DannyZ]

I have windows Server and Plesk Obsidian 18. Running IIS websites. Just 2 websites, php and mysql website on IIS. Almost everyday, IIS hangs and webpage infinite load state, no errors, just loading. App pool recycle has no effect and only IIS server restart solves this hang. After a period same story. This was not happening before plesk, I bought plesk license and installed it, and this error started. Event viewer and logs show no error or warning.

 

[DannyZ]

I discovered something. Advanced Monitoring shows extraordinary cpu and ram usage by plesk in a moment. And at the same time IIS hangs. So I thought this is about plesk cronjobs, and I disabled all plesk owned cronjobs, and thats it, no hang anymore. But how can I find out which job cause this error and what if I never activate the jobs again?

 

[DannyZ]

Today at the same time period iis hang occured. Can this be about bots that crawling data from my site content? A bot that runs everyday same time