As many of you also my GoPro Hero 3 Black edition stops recording without being given any impulse.
I have read a lot of discussion about it and many argue that this problem depends on the micro SD card that is not fast enough but NO ONE recommends a micro SD that is fast enough to solve the problem.
Personally I have this Toshiba Exceria
which should get to write at 30MB/s and read at 95MB/s.
Obviously it is not enough because the movies never get over 25 minutes and at sometimes are also suspended after only 1-2 minutes.
So which micro SD solves the problem?