Symptoms
- A single click opens or selects things twice
- Dragging files drops them unexpectedly
- Problem happens on a specific button, usually left-click
- Issue occurs across multiple apps and even in the OS
Likely causes
- CommonWorn mechanical switch inside the mouseClick switches wear out after tens of millions of clicks and start 'bouncing,' registering one press as two.
- PossibleDouble-click speed setting too fastAn overly sensitive double-click speed setting can occasionally misinterpret input, though this is less common than hardware wear.
- PossibleDust or debris under the buttonDebris can cause a button to make inconsistent contact.
- Less commonDriver or software bugMouse manufacturer software can occasionally introduce click-related bugs after an update.
What to do
- Test the mouse on another computer to confirm the problem follows the mouse, not the PC.
- Adjust the double-click speed in mouse settings (Control Panel or System Settings) to a slower setting and retest.
- Clean around the click buttons with a can of compressed air to rule out debris.
- Update or reinstall any mouse manufacturer software and check for a firmware update.
- Try a different USB port and check if the issue happens in Bluetooth or wired mode differently, if the mouse supports both.
- If available, use a mouse debounce utility as a temporary software workaround.
- If the issue persists across computers and settings, plan to replace the mouse, since switch wear can't be repaired without soldering.
Tools and parts
- Compressed air
Replacement mouseSearch: “USB wired mouse”
When to call a pro
If cleaning and settings changes don't help, this is a worn-out hardware switch; replacing the mouse is more practical than repairing it.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.