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Okay. Just tried something. I used our spare key (which never gets used) and tried to lock it in the trunk. That worked! It belched and refused to close.
So...our normal key seems to be the issue. We've only had the car for a little less than three-months. Could the battery be low already in that fob, and lead to this problem? If so, then it still pretty much defeats the purpose of the protection. We've never plugged the key into the slot inside the car. Should that be more of a regular occurrence?
I haven't read the the entire thread...but $100 says its a low battery.
I don't think it would. I've frequently left my key in my laptop bag or backpack and had it pop open. I wonder if it makes a difference whether the key is really far back in the trunk or right up next to the taillights.