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.

1. Clean the sensor lens with a brush.
2. Test the mouse on a different surface/mousepad.
3. Disable "Enhance pointer precision" in your mouse properties
   a) Control Panel > Mouse
   b) Pointer Options > Uncheck Enhance pointer precision 
4. 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?
5. 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.

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

1. Clean the sensor lens with a brush.

2. Test the mouse on a different surface/mousepad.

3. Disable "Enhance pointer precision" in your mouse properties

    a) Control Panel > Mouse

    b) Pointer Options > Uncheck Enhance pointer precision 

4. Change LOD settings. (For EC-A, FK, ZA,  EC-C, FK-C, ZA-C, S-C, EC-CW seires)

    To learn more about How do you change/reset the LOD (Lift Off Distance) setting of the mouse?

5. Reinstall the mouse driver

    a) Control Panel > Mouse > Device Manager

    b) Expand Mice and other pointing devices > Right-click the HID-compliant mouse and select uninstall

    c) After that is done, restart your PC.