Pressing certain keys (like ctl+F4) results in double action

[jbrams]

When I press certain keys on my t42 the computer reacts as though I've hit them twice.

When I press "forward" or "back" it goes two pages in either direction.

When I press ctl+F4 it closes 2 tabs in Firefox (but pressing ctl+F12 reopens only 1 page).

The problem is inconsistent (sometimes the keys work correctly) but changing the "response time" under hardware settings does not change the result.

Any idea why certain keys result in double strikes while others don't? Any suggestions on how to solve this problem?

Thanks again!