So that's what was causing that! I had all three symptoms, but I thought it was dodgy pins on my keyboard part, or the fact that my Jolla bows up slightly because the phone part of TOHKBD is such a tight fit (so there's a slight gap between the phone and keyboard parts).

Thanks for just coming out and saying you know there's an issue, you'd never get that kind of honesty from one of the megacorps!