I'm using kubuntu/ubuntu 14.04 (both have the problem). When using chromium web browser I experience a problem with typing. After a few minutes of use the keyboard input is not picked up by the browser. If I hold a key down then I sometimes get a response after a delay (press a kety and hold for a second or so then several characters will type but the delete key then takes a while to respond). Firefox is fine and other applications respond as expected. Anybody got any idea?