I started using a GPS logger on my 7D during a trip and had great luck in the first couple days. Halfway during the trip, the camera would completely freeze and display an error. This would happen when trying to store the image onto the CF card. Before snapping a picture, the camera's menu would not recognize the GPS unit.
Does anyone have an idea as to what could cause this? I've since switched to log mode and disconnected the unit to tag later.