Ever since I did the OS upgrade last August, I've had many problems with my Motorola Droid A855. With the 2.1, I had no problems at all and the only thing it doesn't do that the iphone does is drop calls. Now the battery life is horrible, the touch screen is much less responsive, the phone freezes up every other day or so. It reminds me of Vista an want to go back to XP. How do I go back to 2.1?