I have the same problem. I note that when crash occurs, an executable DW20.exe is running 25% of CPU for 3-4 minutes. No special error in httperr logs. I do not find any user.dmp on the server. Where this file may be saved ?

for the starters you can check these threads and find out if any of them help you out : http://forums.iis.net/p/1121555/1752816.aspx http://forums.iis.net/p/1083058/1606163.aspx http://forums.iis.net/p/1000874/1318947.aspx http://forums.iis.net/p/1000874/1318843.aspx