I bought my unit (N810) last week. At first, It was a breeze. I updated the OS and still it was doing Okay. Until the time when I want to watch D. Gray Man at YouTube. It says that I need to install Flash player. What I did was I updated the OS again. The YouTube was again playing fine. I turned my tablet off to watch TV. After a few hours, when I turned it on it wouldn't. Took the battery off the unit and waited 8 hours; It did turn on but just to check if it's working okay, I turned it off. And alas, it wouldn't turn on again. The cycle has been the same. Must wait for few hours to turn it on. I brought it back to Wal-Mart for a refund. Now, I want to purchase it again. I am afraid that this would happen again as I've been reading on the net that this is an ongoing problem. Any advice? Thanks.