eulerfibonacci

I’ve been working on a robot project, that uses a GY521(MPU6050). I use it with the code MPU6050_DMP6 provided by i2cdevlib. The robot only start other sensors and motors after the gyroscope is working and stabilized (I wait until the Yaw stabilizes). But there’s a problem, when I started working with it, the gyroscope always worked. Now, sometimes it start as it should, but most of the time I receive a connection failed from GY521. Any ideas n how can I solve this problem? Thanks in advance.