Application pool recycle is terminating connections

[anson9]

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

 

[anson9]

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?