The newest releases of Windows has two new features. One is the jumping cursor. With this feature, you can be typing along on one line and have your cursor automatically jump to another random location. This feature is handy if you want some interesting sentence structures.
The other feature is the page clear key. Microsoft has incorporated a new function key that will erase everything that you have just typed and transport you to a new page. This feature will automatically detect when you are too wordy in your writing and make you start over again.
Microsoft, the company that we love to hate.
If it’s a laptop, perhaps your inadvertently hitting the touch mouse pad with wrist. Disable it, and the mouse will settle down.