I'm using my brand-new K2, and hopefully that will bring to light any problems or defects that would justify an exchange, but I'd like to be sure I don't miss anything before the 30-day return is up. Flaws that seem to occur moderately often that I know to look for from doing my background research are:
1) Exposing the screen to direct sunlight for awhile to see if it fades.
2) Checking the smallest font sizes to make sure they are still clear and legible.
3) Checking the hinges on all the buttons and rockers to make sure they are aligned properly and work smoothly.
Anything else I should check out? Especially a problem that I might not easily find in the course of reading?

(of course this means that it is unlikely to be a fatal flaw, even if it is a defect)
Thanks for any suggestions!