My macbook pro keyboard and my silver Apple bluetooth keyboard (primary keyboard) randomly stop working in Finder can anyone explain? Heres the details:

I usually use my wireless keyboard, and when this happens the keyboard keeps working with everything else, and only stops working in Finder i.e. I can't edit the names of files or even click through files with the arrow keys. (the Macbook Pro keyboard also stops working-only in Finder-during these times too as I just tested..)

Also, Finder keeps working its not frozen or anything, I can click around in it with the mouse and open files/apps, etc.

This has only happened approximately 3 or 4 times (I've had the keyboard since the new ones were released and the computer for 1.5 yrs)

Lastly, when I restart the OS (10.4.11) the problem disappears for a week or more..

help!