If you are experiencing issues with the scroll function on your G502 (X, LIGHTSPEED, or PLUS), do the following:

• Clean off dust or dirt on your mouse using a Q-tip or a compressed can of air.
• Test your mouse on a different surface or mouse pad.
• Update the device's firmware:
  1. Download and install Logitech G HUB.
  2. Open G HUB, select the mouse from the home screen, and then go Settings.
  3. If a firmware update is available, a blue Update button appears under the firmware version on the top right corner of the window. Click Update and follow the onscreen instructions.
• In G HUB, try adjusting the DPI settings.
• Make sure the wheel itself moves and isn’t physically stuck.
• Unpair and repair the mouse, or disconnect and reconnect hardware.
• Windows only — try a different USB port or on a different computer. If it works on a different computer, then the issue might be related to a USB chipset driver. Updating the motherboard USB chipset driver may make a difference.