cursor jumps back during typing

[ichabod801]

Funny story: After my dad's stroke he was having problems using the mouse for his computer. So I went and got him a trackball, which was a lot easier for him. Some time later he starts having problems with the trackball. So he calls up Dell support. He doesn't tell them it's a third party trackball, because he knows they won't help him out. Since they don't know it's a third party trackball, they can't figure out what the problem is. He's frustrating the hell out of them for hours until I show up.

Me: "Have you tried changing the batteries?"

Dad: "What batteries?"

I normally avoid wireless peripherals, but they didn't have any wired ones when I'd been to the store to get it.