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I was making a four-motor aircraft with Intel Galileo, using sensor MPU6050(via 12C interface) to capture the flying attitude of my aircraft and Servo library to make motor work well.After reading the datasheet of Intel Galileo, I know that CY8C9540A I/O expander interacts with Quark by I2C interface derive the PWM wave. In practice, the whole system runs well at the beginning, but it doesn’t work after a while, neither the electrical machine nor the sensor. By serial monitor, the values of Euler angles do not change when I move the aircraft. Four motors also stop. Is it the problem that there exists a conflict in I2C bus? If it is, how can I fix it? Or is there any other possibility for the system stoppage?