Not sure if it's coincidence, but the second box of strips I have been using after the change has produced ten errors so far - a couple of 'faulty strip' a couple of 'too much blood' and 6 that simply didn't register at allNever had problems like that before.
I'm on my 3rd Nano in as many years, and my current one is playing up again. Another call to Roche is on the cards me thinks.
I'm on my third too - there's a flaw with the batteries I believe.