Have a look at the following Article and attachment to that:
QIX engine
That should help to a degree, but what should be occurring is some other process has a lock on the additional memory, otherwise the QVS process should be able to get hold of it. If you check the QVS Event log, you should on a QVS service restart that it lists the Low and High Working Set limits, that should be another thing to check to be sure those values returned there are what you expect to see, as the memory limits are determined when the service starts, so if there was another process running at that time that was using the other memory, that would change the limits for QVS etc. Hopefully this may get you on the right track to getting things sorted out.
Regards,
Brett
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