I tried it on 2 different glass surfaces as well as 3 tables. all the same result. i called apple. they told me to put 2 business cards under the high corner to see if they touch (they didnt), then told me to reseat the battery, then said to rotate it and try different surfaces. Then the rep said he would transfer me to a higher authority person which eventually i was hung up on while i was waiting. and i was extremly polite during this whole ordeal. so i call again, was polite as usual, and they said they were going to send me a box to send back to them so they would fix it.... not a big fan of apple at the moment considering i just got this and a 60 gig ipod color screen