Drift of values read by Arduino MPU6050 sensor
Did you remember to compensate for temperature? It is not coïncidence that the device has an integratged temperature sensor.


  7.19 Digital Output Temperature Sensor
  
  An on chip temperature sensor and ADC are used to measure the MPU-60X0
  die temperature. The readings from the ADC can be read from the FIFO
  or the Sensor Data registers.