I have had this tablet since august. I feel it worked ok... until this authentication problem. I only noticed because my tablet data usage amount suddenly went up. ONLY happens at my apt. my HTC works fine. everywhere.. the tablet works with wifi everywhere but here now... help
First thing I would try is to hold the name of the wifi network down until it gives you the option to forget the network, and then reset the connection. This will require you reentering the password. If that doesn't work, you may want to try turning the router off then back on again, or maybe resetting the router completely.
If none of those things work, I've found that for some reason, putting your device in airplane mode, and then turning it off and then back on again seems to resolve several odd wifi connection issues.
Hope this works!