So I just got the 4k yesterday and made sure all firmware was up to date and calibrated everything. Took it out for first flight today. Took off and hovered at about 10 feet for a couple minutes and all good. Climbed and started out, it gets to about 40 feet and the thing throws a prop, flips over and crashes upside down! Im 100% sure they were tightened snug. As a rookie I'm at a loss. Looks like a new body, gimbal mount and learning to work on it is in my future.