Hi Guys
Dave got it!
I don't know that hitting the Insert key is what causes it, but it does turn it off.
My insert key is nowhere near where my fingers are at on the keyboard when I'm typing, it's actually on a separate keypad off to the right of the regular keys.
I have to lift my hand up and move it over to hit it.
I've always felt that I was hitting some key combination in the lower left of the keyboard when it happened but, as I said when I experimented I couldn't find any combination of keys that did it.
But to tell the truth, I had no idea what the Insert key was used for (kind of like the End key)!
Anyway all I really needed to know was how to turn it off, and hitting the Insert key does that.
Thanks for the help, I...