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Ghost cursor drift is spooky but explainable. Before you buy a new mouse, check these common culprits.
This is the #1 cause of drift. If you have an Xbox or PlayStation controller plugged in (or connected via Bluetooth), a slightly tilted joystick will move your mouse cursor. Disconnect it to verify.
If you are on a laptop, your palm might be brushing the touchpad. Use Fn + F-key (e.g., F9) to disable it, or go to Settings > Bluetooth & devices > Touchpad and set it to turn off when a mouse is connected.
A single hair stranding across the sensor lens can cause the mouse to drift slowly. Flip the mouse and inspect closely with a light.
Most optical sensors cannot track on glass or polished wood. The light passes through instead of reflecting back. Solution: Use a mousepad or a piece of paper.
If your mouse uses a USB dongle, it might be fighting with your router or USB 3.0 ports. Solution: Use the extender cable to move the dongle closer to the mouse and away from the PC tower.