Analising Audio lock up

I am getting a problem when editing waves in the Wave Editor. If I try to noise gate a section to remove some audio or copy a section a dialogue box with Analysing Audio appears and keeps completing, locking the system up. The only way to escape is to Ctrl+Atl+Del. If left Cubase closes automatically.
This is really proving to be a very severe problem and hampering a contract.

Glenn :frowning: