I bought my beetle brand new in February, and today I noticed the key is very weak. I have to be standing next to window in order to get it to remotely deactivate the alarm. It seems like I haven't had the car long enough for the remote to be dead. Do I have to take it to the dealership to have the battery replaced? Do I need both remotes to change the battery so the alarm can be reset? Or could it be a faulty transmitter and not the battery at all?