Never on 24 March 2014
Made an account to answer this.
Yes, I had this issue once. Unplugging the Wii U for a bit then resyning the gamepad temperately fixed the issue but it always came back after a few days. I came close to returning it to nintendo.
I believe this issue was related to an old router in the neighbouring room. It was very old and never operated on the same frequency as my Wii U's gamepad but must have been giving some kind of interference. The day I got a new router with a new internet service provider the issue completely stopped.
