Thanks for your reply. I’ve tried being a bit more careful and it has improved the situation slightly. The problem is still evident however and some of the missed key presses occur when a clear audible click can be heard from the key. Maybe I’m just going to have to live with this.
I now have a far greater problem with the keyboard - when I’m editing a basic program in PicoMite’s Basic editor the message “I2C Keyboard not responding” appears continuously on the screen (fills the whole screen then scrolls until the picocalc is switched off). This has happened several times now. Anybody know what’s happening here ? I should mention that I’m using GP4 and GP5 on the expansion connector for serial comms but I can’t see how those pins could affect the keyboard’s operation.