Problem with Kontakt Library

I am using Cubase 5. When I insert some of the Kontakt plugins(like Mojo Horn) , the instrument stops working after some time. I can see the MIDI input on transport pannel but the sound is not heard on playig on my keybord or playing on the keyboard on the Kontakt plugin. What could be the issue? I did some googling and found the below link.

It says the voluem of Kontakt is reduced after some time and the volume can be increased on the Kontakt plugin itself. But exactly which is the volume control on Kontakt Mojo horn section? I couldn’t find the volume control.Could someone please help with this?

Any updates on this?

If anyone has encountered similar situation , please respond. I am stuck