debug iis application crash dump

Hi, I have a Windows 2008 R2 web site running several web sites in several application pools. Some applications pools are failing with the following error: "A process serving application pool '[login to view URL] v4.0 (Integrated)' suffered a fatal communication error with the Windows Process Activation Service. The process id was '4344'. The data field contains the error number. I have captured a user crash dump from the time of the failure using debugdiag tool, and had the tool anaylze them. I need someone that will be able to tell me what is causing the failures, and what do I need to do to fix the problem, so the unexpected failures of the application pools will be resolved. This should be an easy project for the right person. I will provide access to my machine using anydesk to troubleshoot this. Thanks, Guy