at different times while typing the keyboard seems to lose focus or partially inactive.I can not continue to type, use delete, enter or escape with any result. I can open menus to close some windows, but must do force quit. Using restart often returns normal keyboarding - as long as reopen windows is not checked. I think I am inadvertently tapping the trackpad while typing. Fairly sure this occurs only when speed typing in I messages, but all finder docs are affected the same. I'm hoping that there is some key combination is available to bring keyboard back in use when this happens again. Thanks for any & all suggestions.