Residue can build-up over time in the device and prohibit usability. Use a thin brush or cotton swab with 99% isopropyl alcohol and scrub the crevices around the buttons. An alternative can involve blowing air out of a straw to clean out the residue. This will clean build-up and allow the buttons to function.

Restarting the device restarts each of the systems in the device. Turning it off and back on again can return the device to its original settings and allow it to function correctly. Pressing and holding the button will bring a separate screen up. Press “restart”. This will turn off all background processes and restart all systems, allowing it to operate smoothly.

Updates contain bug fixes that could resolve improper function. Updates are released by the developer of the device and add support to the software. Updating the device updates the software. To update the Logitech G Cloud, turn the device on and click the Settings icon in the top left corner. From here, press “System Updates,” then “Check for Updates.” Update the device if there is an available update.

If the L1-L2 buttons no longer function after updating, restarting, and cleaning, it's likely that the buttons have been permanently damaged. In this case, a replacement is the next option.

Follow the step-by-step guide [here] to replace the L1-L2 buttons.