Not sure why, when 1st turning it on and you go into the menu to setup Wi-Fi , find your network and select it. then you should have to enter your password or code if your Wi-Fi is locked for security purposes. after you enter it should auto connect. My tablet gets used all over a 2 story house and has had no problems with keeping the connection.
As far as cameras go, the resolution isn't great, better have good lighting. There is some resolution adjustment in the camera settings. The Mic. I have no idea, I don't have one to even try it and report back to you.