A large complex machine with hundreds of precisely engineered parts controlled by multiple embedded computer systems with an array of sensors and safety fallback systems and powered by thousands of explosions per minute using remains of extinct creatures from millions of years ago had a malfunction. Yep it's because it's cheap and definitely not because complex machines built in batches of a few thousand at a time sometimes have a glitch or an out of spec part. You want to pay Ford prices but expect NASA levels of precision and reliability.