Purchased Yesterday, Used Today, Froze Up.

Took it out for trial run on bike ride. Video worked well, still photos worked before I left the house, but after taking video, still photos did not work, then the screen froze. I did not reset with a pin because I thought I might lose my videos and photos until after I took the chip out. Would I have lost the photos if I "pinned" it with the chip still in place? Also, why did it freeze up? None of the buttons worked after it froze and I didn't have a pin with me while riding. Will try again after response, if it does is again, it will be returned.