Hi @Raja ,
I think your problem requires using a debugging tool (such as IIS Debug Diagnostics) and taking a dump of the process to see why it's crashing. See this article How to use the Debug Diagnostic Tool to troubleshoot a process that has stopped responding in IIS.
In addtion, If you can, I suggest you'd better open a support ticket via: https://support.microsoft.com, because they will analyze the dump file for you more professionally to solve your problem.
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Best regards,
Yurong Dai