I've had my 10.1 for 6 months, and it suddenly won't connect to the wireless. It says Trying to Connect, then immediately says "Error". It does not show the name of my router or any of the others nearby. The Add Wireless button is greyed out. It acts as though the wireless card is turned off. The Airplane mode is not on. It responds when I turn Bluetooth on. I've rebooted several times but still no connection. What can I do?