If the keyboard on your Lenovo laptop or PC isn't working properly, don't panic—we've got you covered. Several Lenovo laptop or PC users have mentioned Lenovo Repair Service USA. Use one of the easy fixes listed below to fix the Lenovo keyboard. You might not need to give them all a try; simply move down the list until you find the one that best meets your needs.

1. Switch off your laptop or PC.
2. reinstall the driver.
3. Diagonally press the problematic keys.
4. Remove the power cable and the battery.
5. To restore the system

Source:https://www.repair-service-center.com/lenovo/lenovo-service-center.php