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Who told you it was an electrical interference?
Did they say what in or near that particular parking lot was doing the interference?
Did they say what it was interfering with?
Does the security light come onw when this happens?
Some brands/types of mobile phone or laptop computer chargers may cause interference that could lead to a PATS (Passive Anti-Theft System) concern if the passive key is within close proximity of the charger.
Is the No Key Detected displays in the message center?
If so, that might be caused by Environmental interference.