Hi Douglas
Thank you for your reply. Unfortunately, I have not been able to solve the problem.
I Run the "Hardware and Devices" and "Keyboard" troubleshooters and got the following feedback respectively:
"Troubleshooting couldn't identify the problem" and "Troubleshooting has completed. No changes or updates were necessary".
This is most likely because the keyboard is running smoothly with the exception of the mentioned keys.
I also checked the Device Manager and searched online for the keyboard driver updates. It said that I am running the latest available.
I forwarded this issue to Linx support and expect a reply in the following days.
Thanks for your help.
Jorge