Symptoms
- Cursor jumps to random spots on screen
- Cursor moves without touching the mouse or trackpad
- Clicking happens on its own
- Issue is worse on certain surfaces or when palm rests near trackpad
Likely causes
- CommonDirty or obstructed sensorDust or debris on an optical sensor can cause erratic tracking.
- CommonReflective, glass, or patterned surfaceCertain surfaces confuse optical sensors and cause jumpy movement.
- CommonPalm accidentally touching the trackpad while typingPalm rejection settings can be too sensitive or disabled, causing accidental cursor jumps.
- PossibleElectrical interference or a failing wireless connectionA weak wireless signal can cause dropped or garbled position data that looks like random jumps.
- Less commonFailing mouse or trackpad hardwareInternal sensor or connector damage can cause persistent erratic behavior.
What to do
- Clean the mouse sensor or trackpad surface with a dry cloth and compressed air to remove debris.
- Switch to a plain matte surface or mouse pad if using an optical/laser mouse.
- Adjust trackpad palm-rejection sensitivity in touchpad settings if the jumping happens while typing.
- Move the wireless receiver closer to the mouse or switch to a wired connection temporarily to test.
- Update the mouse or trackpad driver.
- Test an external mouse to see if the trackpad specifically is the problem, or vice versa.
- Restart the computer to rule out a temporary software glitch.
Tools and parts
- Compressed air
- Soft cloth
Mouse padSearch: “matte mouse pad”
When to call a pro
If the erratic movement continues after cleaning and testing on a different surface or computer, the pointing device's internal hardware likely needs replacement.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.