When you get it, charge it til it's full and then update the firmware. The latest firmware solves various bugs.

Also, as it's an N810, you might want to format the built-in 2GB memory card before you start using it because there was a problem in the way some units were formatted at the factory. It's very easy to correct this, just go to the file manager, select the memory card and select the format option:

http://tabletschool.blogspot.com/200...d-on-n810.html

The odds are that your card is fine, but the process of checking whether it's fine is a lot more complicated than the process of fixing any potential problem, so it's easier just to fix it even if it isn't broken.