GoPro's from 3 and upwards are temperamental little things when it comes to what Mirco SD Card's they like. First rule of thumb is to avoid ALL non-branded cards. Second rule would be to make sure the card you use is a high rating card with plenty of space. Mirco SD cards have little rating numbers on them, 10, I believe, being the better rating, with no number at all the equivalent of a 1 rating. Third, and most important rule of thumb though, is to BITE THE BULLET so to speak, and invest in a card that is supported by GoPro themselves. One of the BIGGEST reasons for lost or corrupt recording is due to Cheap, Bad, Incorrect SD cards. So for you Snakeeyes75, it would be one of the following;
I know people like to save a few quid... but you'll be kicking yourself when you lose a full weekends worth of footage (as i have done) across three different cards. It's just not worth chancing someone elses opinion just because they've never had any trouble with a certain card, especially when GoPro model and recording settings all come into play. My first post, and my two cent's from 3 years GoPro-ing experience. Hope this helps!