Hi, I would appreciate for any comments on the following issue. The remote key for my 2007 chevy impala used to work. But recently it only works if I manually open the door first. Only after the door is opened, the key fully functions, including the opening, closing, and the back trunk. I can also remotely lock the door. But just after a few minutes of locking the door, the remote key will already NOT work outside again. Thanks.