No matter how much DJI attempts to reinforce the frame, plastic is going to occasionally crack, especially when excessive forces are applied. Like many, I've read countless posts in regards to this topic however, most P3 and P4 owners never have an issue. Undoubtedly, some that have experienced the cracked shell issue, fly very aggressively. Some may have had the problem due to overtightened screws, minor crashes etc. DJI has responded by reinforcing frames in the Phantom which definitely cutdown on the number of complaints I've witnessed on this forum however, the issue still exists. FW upgrades reducing descent and ascent speeds also will contribute to reducing the number of reported problems. The Phantom is lightweight, fragile and was never designed or sold as a product designed to be flown aggressively.