I've learned a trick that seems to stop my alarm from going off when unlocking from the trunk. It looks as though the door locks become slower to unlock as the weather gets colder. I've discovered that if I open the trunk before all the locks are up, the alarm goes off. If I wait for all the locks to come up, no alarm. When it's after dusk, I can usually look at the alarm light on the center console, but if it's bright out, I watch the locks.