Hoping that someone else may know a lot more about go pros than I do and can offer some advice. I purchased a hero 4 black (second hand) a few months ago and immediately started bringing it with me on fishing trips and filming the whole day. Took it out for 3 trips and everything seemed to work fine. While snorkeling two weeks ago the camera starts beeping and the screen said "sd error", couldn't get it to work the rest of the trip. Got home wiped the memory of the card followed the instructions online that told me how to reset the card and camera together and went out again. 15 minutes in and camera starts beeping again with the same error message. Anyone know if this is a card related or camera related issue and any advice on what to do to remedy the situation. I purchased the camera second hand so I can't return it but the card was brand new. Appreciate any help.