Stu: @MikeB4 I think you have the VTV I should've ended up with. I quite often end up with the one-in-a-million fizzer unit! Thankfully, other than a couple of occasional glitches, the two I have here are pretty rock solid (knocks on wood). If a factory reset doesn't fix things for you, I'd be requesting a replacement.
I am going to try that. I have packed the thing away in the office and will look at it maybe next week.