Just re-read your post from last September about the internal shakiness or internal tremors. I had it a year or so ago, then it left, now it's been back for weeks and is REALLY getting on my nerves. Have you had any luck in your detective work trying to determine the cause? I would really be interested in your findings, and I'm sure others would, too. I seem to only notice it at night, not sure if that's because it's quieter and I'm not at work?? Thanks!