Curser problems and more!

The cuser jumps around at will.
The pages keep jumping to the bottom. Arrow up and i fight with it to stay up at the top of page.
The space bar sometimes doesn't work.
Difficult to type. I try to click on something in the middle of a sentance and the guide vertical line scrolls over to the right of the sentance. Sometimes scrolls over each line all the way to the bottom of the page uncontrollably.