When the car is sleeping and I approach my vehicle with my HPWC in hand and press the button on the cable nothing happens. I allow the car to "go to sleep" in order to minimize vampire loss as it sits for many days when I travel for work. This is really annoying. The only way to resolve this is for me to approach car with my key so it wakes up. Then, and only then, will pressing the button on the charging cable open the charge port door. Or not allow it to "sleep". Is this normal? Am I doing something wrong? Advice appreciated.