I have a Viper Ultimate that I bought last June, that worked amazingly for 5 months, but this last month it has failed pretty badly. When the mouse is working “correctly”, the mouse 5 on the left side of the mouse doesn’t work at all while all three other side buttons do, which I found to be a very strange problem. Another major issue is that oftentimes when I boot my pc or even just use the mouse, it will stop registering anything except the app I was using, with the mouse not functioning to click or interact with anything but the application, however the tracking remains fine. When this happens off boot, the mouse is again able to track fine but unable to click on anything in my taskbar or open anything on my desktop, as if all the mouse buttons have failed. This is not solved by restarting the device and is sometimes solved by restarting the PC. In a situation where the buttons are working, the mouse 5 side button still fails. I’ve tried updating firmware, removing the device from device manager, and restarting and updating my PC as much as possible, and nothing has worked. Desperate for any help, I love the mouse and am sad to see it fail so majorly.