I have a Kenwood DNX 7100 DVD/Navigation system. I had it installed probably almost a year ago. One probablem that I seem to encounter maybe once every 3 or 4 weeks is it won't turn on. I take the key out, turn it again, start the car, turn it to accessories, etc but still no power. If I take off the bezel and remove and reinsert the inline fuse it will power right up. The fuse seems to be fully seated. Any ideas on what the root cause could be?