Just got a new Nexus 7 2nd Gen (32GB) and I've noticed that when I bring the tablet up close, I can hear kind of an electronic buzz whenever it's doing a task. Is that normal? It doesn't appear to be the speaker buzz I've heard about, as it's coming from the front, not the back. It's faint, and not so loud that it's extremely noticeable, as you do have to bring it quite close to hear it. Just wondering if this is a normal thing or if I need to send it back? Thanks in advance.