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Most of the times that I’ve gotten complaints about this, it was when someone was using an optical mouse on a glass surface. If you have a glass desk (this may be true for other glossy surfaces as well) try a mouse pad - I bet it will resolve the issue. If there isn’t a mouse pad nearby, you can just use a piece of paper to see if it makes a difference. Other than that, I would clean the bottom of the mouse with either a microfiber cloth or a cotton t-shirt. You might also want to try unplugging the mouse and plugging it back it in, or, if it is wireless replace the battery.