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.