Application pool recycle is terminating connections

I am administering a Wink2k3 IIS 6.0 server that hosts an application called
Red Dot. Recently, the application pool recycle has been killing all active
user connections. The following 2 system event log items will sometimes
accompany the recycle:

http://www.eventid.net/display.asp?eventid=1074&eventno=4075&source=W3SVC&phase=1

http://www.eventid.net/display.asp?eventid=1013&eventno=3187&source=W3SVC&phase=1


Why would this happen? Is this likely IIS malfunctioning or the product?

Thanks,
Jaime

Strago
Fri Mar 30 08:14:01 CDT 2007

Additional info:

One of the dllhost.exe instances looks suspect, it will gradually grow in
size up to over 600MB by the time the recycle occurs. Is this likely the
cause? Is this size unusually large?