Karen has an issue with a "jumping cursor" when she types on her laptop. Leo says it's a common problem when you have a laptop with a trackpad. The solution is to go into the settings and turn off the trackpad when you're doing a lot of typing. She can also adjust the sensitivity of the trackpad. It could also be that the trackpad is dirty, or that it's static electricity causing it. She can just plug in a separate keyboard via USB and see if it happens. If it does, then there's a hardware issue.
The chatroom found a page at smallbusiness.chron.com about this issue.