The mouse works fine when moving up or down, but when the mouse points in any other direction, the sensor lags, stops entirely, or moves at 1/3 speed. What should I do?

Please test the unit on another PC and/or USB-port and follow these troubleshooting steps.

Clean the sensor lens with a brush.
Test the mouse on a different surface/mousepad.
Disable "Enhance pointer precision" in your mouse properties
a) Control Panel > Mouse
b) Pointer Options > Uncheck Enhance pointer precision
Change LOD settings. (For EC-A, FK, ZA, EC-C, FK-C, ZA-C, S-C, EC-CW seires, U2, DW series)
To learn more about How do you change/reset the LOD (Lift Off Distance) setting of the mouse?
Reinstall the mouse driver
a) Control Panel > Mouse > Device Manager
b) Expand Mice and other pointing devices > Right-click HID-compliant mouse and select uninstall
c) After that is done, restart your PC.

Applicable Models

EC1-A (L), EC2-A (M), FK1 (L), FK1+ (XL), FK2 (M), ZA11 (L), ZA12 (M), ZA13 (S)

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The mouse works fine when moving up or down, but when the mouse points in any other direction, the sensor lags, stops entirely, or moves at 1/3 speed. What should I do?

Applicable Models