Seat Belt Alarm goes off randomly

[HGH]

Hello! My 2006 Boxster S (987 Tip) keeps ringing the seat belt chime, and displaying the visible alarm, for no good reason. I always buckle up, it does it with the driver o with both passengers, and even if i buckle the unused right belt.
This is not a case of me wanting to disconnect the alarms, but of making it work properly. I see that the buckles themselves could be the case, or the ignition switch unit, from reading posts.
Now it is making it imposible to use, itīs on very frequently.
Is there something I can do, before going to the dealer, which here in Mexico City where I live, is even more expensive tan you can imagine?
Also, is the electrical part of the ignition switch not available form Pelican for the 987, only for the 986?

Thanks!