Okay, has anyone else run into this: in the last few days when I start my 2001 9-5 within five seconds of the engine igniting there's a little buzz, a slight vibration, at the key. Lasts no more than a second, but it's a little like a cellphone vibration. Car shows all tests fine, car seems to handle well. The only time there is that buzz is when I start the car. Has anyone else seen this and do they have an idea what it might be?