Keyboard letters give different outputs

[harm_less]

I had a similar thing going on as I discussed here. I've just realised that I haven't had this happen for a couple of weeks now so perhaps Firefox update or something else has remedied it. The last few times I had it happen I found that ust clicking on a cell in an Excel document I had running was enough to 'reboot' enough for the random keyboard values to correct themselves when I resumed typing.