How do I troubleshoot tough drone failures?

You maintain most drones well now. The complex failures still stump you because they are the puzzles where the obvious answer is wrong and the real cause hides. Those are hard for every technician. Being stumped by them is the normal edge of getting good. Complex troubleshooting is a method, not a gift. When the simple checks fail, the skilled techs slow down and work systematically, isolating one system at a time instead of guessing. What looks like intuition is usually patient elimination done fast from practice. Next time a failure stumps you, resist the urge to swap parts randomly. Write down what works and what does not, and rule things out one by one. Keep a log of the strange failures and how they resolved. Over time that log becomes the intuition you are missing now.