Jog dial control buttons on Olympus OM-D E-M1 twitchy or sticky

Jog dial control buttons on Olympus OM-D E-M1 twitchy or sticky

I have the above camera which works well, but when I need to access the menus via the "jog dial" / buttons, they either stick and need extra pressure to regiter a push, or are super-sensitive and react too fast (like a double-click...) .