HTML editor reseting on its own

Haven’t found anything in the forums about this but maybe I am using the wrong keyword.

I am trying to use the HTML editor (I have give up on all visual editors). The HTML editor is working fine for me with 1 massive exception. Everytime I scroll down to type beyond the 10 lines showing the scroll bar resets its position back to the top. I then have to start scrolling again to see what I am typing, it resets to the top again, and again. It is a massive pain. Changing the amount of lines showing does not solve the problem.

Has anyone had any other problems with this or a solution to fix?

Thanks,

rpersonal2