Keyboard just turns off on XP guest

[grunners]

Hi

I'm running Ubuntu 9.04 64bit as my host, with XP SP3 as guest. All is ok except the keyboard on the guest just suddenly stops working at what seem to be random times. The only way to get it working again is to enter the host and type into a terminal, then the keyboard is enable again in the guest! Has anyone else had this issue? I'm using 3.0.4 by the way.

many thanks

[grunners]

Update:

Minimising and restoring solves it. But still.....