A while back, 6 months or so, I dropped my bb 7290 and the display was inverted when I picked it up. I didn't think much about it at the time, I just took out the battery and reinstalled it and the display was alright. Now it seems like it happens all the time, at least 2 times a day, without any impact of any sort. Has anyone else had this problem & what did you do to fix it?