My GoPro HD helmet Hero freezing while filming. It simply freezes up and the buttons don't work. I need to remove the battery to reset the camera and all my video is lost. I'm using a sandisk 32GB SD Card.

Unless the camera is actually in record mode, your previous video files should be complete on the SD card and should not be affected by removing the battery. The freezing COULD be a result of the SD card itself. Most live video recording devices which use media of this type work best with cards that are rated "Class 4" or higher. (Class refers to the read/write speed of the card; the higher the class, the faster it performs.) The class rating is usually shown inside a small circle printed on the card. A 32 GB card of Class 4 or higher is still pretty pricey, so if yours is only Class 2, the camera circuitry may be sending data to the card faster than it can handle it, thus locking it up. You might be better off with a smaller capacity card (16 or even 8 GB) that has a higher Class rating (4 or even 6). *Disclaimer: I am not a lawyer, despite the handle. Words to live by: "Every creative act results from a sudden cessation of stupidity." -Edwin H. Land, inventor of the Polaroid Land Camera "The problem can always be solved with the materials in the room." -My college Physics Lab Instructor