hammers2332

Drain Gamepad battery until it's completely dead.

After powering down, Unplug Wii U and TV from everything (HDMI, Power, etc.)

Wait 30 minutes.

Recharge Gamepad.

Plug wii and TV back into power.

Reconnect HDMI to Wii U and TV, but don't turn anything on yet.

When Gamepad is sufficiently recharged, turn on Wii U and TV.

with wireless technologies there can be some handshake issues.

Also, with HDMI there can be major handshake issues (especially with Samsung and Vizio televisions).

What we have done here is allowed the TV, Wii U, and Gamepad to reestablish handshakes anew.

If this doesn't clear the problem, then please call Nintendo.

There are other troubleshooting steps to perform.  And it's best to have them guide you.

Finally, make sure you don't have the Wii U or game pad very close to other equipment that could cause interference.