Ok. Let's share notes....
GoPro Black and a SanDisk memory card. Failed about 20 minutes into a flight I really wanted to record - aerobatics in a P51. Was pretty PO'd at the time. Turns out GoPro knew about the incompatibility with the memory card but didn't do anything to warn customers. I have since moved to the Contour brand. I wish I could say the Contour never fails...
I have the hero3 white, no issues besides battery life sucks
To save the battery, I DO NOT use the wifi to control the cam from inside the plane.. I just turn it on after the preflight and off when I get back to the hangar.. :
It really seems like most GoPro related problems have to do with the SD Card. I have a GoPro Hero 2 and bought an extended battery right before my first long student solo XC. I had a Kingston 32GB SD card in it that worked great for about a year. On a flight I really wanted to record a month ago (first actual IMC instrument lesson), it locked up on the first leg of the flight. I had to remove the battery to get it to shut off. On the way back, it stopped recording right as we flew over San Francisco. It's like the GoPro knows when the best time to fail is!
I got a new, very fast SD card, a Lexar 633x 32GB "High-Performance" Micro SD card and used a adapter to fit it in my Hero 2. After about 2.8 hours of recording two different flights, I think I can say the SD card fixed the problem. Also, I reformat the card before every use. I'm not sure that really helps but, it can't hurt!