I unfortunately do not have the time or resources to poll the several hundred residents of this complex to find out their experiences with the gate.
To open the gate, one simply places the keycard on the receiver, and the gate is supposed to open. That is why I categorized it as ridiculous that I am somehow at fault.
Ok, make it simpler:
have you ever hear or seen ANYBODY else having the same issue you have?
and how it can be your fault:
without knowing the specific system cannot say with any certainty but if you have a magnetic based data storage on/in the card, you can damage those or deprogram them by exposing them to a degausser or any magnetic field (like they do with the magnetic security tags at stores).
Heat can affect them as well.
if it is an rfid card, there is less chance of it being your problem but there are still a few things you can do to damage the card.
so, is your card programmed specifically for an individual or does it have a preset id code within? The first means it is likely magnetic storage, the latter means likely to be rfid.
if magnetic, do you ever go to a store that uses a deactivation device for magnetic based security tags? Do you work anywhere or go anywhere you might be exposed to a magnetic field?
how is the technician fixing the issue? do you end up with a new card? Does he even use your card while diagnosing the problem?