I would not say it 100% fixed it Jack, I've not played my keyboards for some weeks, but I can say it definitely improved it dramatically.
In my testing of 1.05 firmware, it was quickly apparent things had improved, in general use I found if I pressed on the low side of the button or between the low side and centre just occasionally, and by that I mean probably once or twice out of say 40 or 50 presses it would exit, so definitely a big improvement. If I always pressed in the centre or between centre and the high side it never exited at all, and over time that's how I now always press them. So definitely some noticeable improvement.
As far as I'm concerned it's pretty much become a non issue, AIS I had become accustomed to pressing the buttons towards the high side anyway, and since the 1.05 firmware it's almost impossible to get it to exit, and can only do so by deliberately pressing the low side of the button, where previously doing so would have exited 1 in 5 presses.
I would also think later models would likely have improved switch panels, as I still think the original problem was likely hardware, which has been disguised/fixed by a software update, so you really shouldn't have any issues on later models anyway I wouldn't have thought, as the ones you and I bought were some of the first in the UK last year.
Best wishes.
Cameron