I have owned my SAPHIRA for about 2 years and love it to death. It is by far the most comfortable mouse I've used and I love the simple design. For the past year or so, the scroll wheel has been acting up. When scrolling down there are no issues but when I attempt to scroll up the pattern is jumpy and very buggy. As an example, if i am scrolling up on a web page, the page scrolls for 2-3 ticks then shoots back down instantly about twice the distance I just scrolled up. This results in a page actually moving down when I try to scroll up. I'm not sure if this is a known issue but a friend of mine had the same issue with his SAPHIRA last year. Other than this issue the mouse is in prime condition and I don't want to have to buy a new one just to get the scroll wheel to work. Has anyone else experienced this issue?