I've been having some electrical issues with my 2005 Focus. I apologize if this same issue has been raised in the past. About a year ago, it did this thing where it made a clicking noise that sounded to be coming from the steering wheel/dash area. At the same time, the headlights were flickering and the radio would turn on and off. Once the vehicle was turned off, the battery was completely dead and had to be jump started. I didn't happen again for about 6 months. It has now happened about 4 times in the last 2 weeks. It has been taken to 2 different mechanics (one of which was the Ford dealership), but they could not find any problems with the battery, alternator, etc, and of course the problem won't replicate itself when its at the shop. Any suggestions on what we should try next?