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I have flashed the latest firmware on the CF2. After reading some of the threads on forum I tried starting up from a flat non-static surface (as you asked), swapping new motors, changing props, checked prop installation for correctness, etc. I'm not sure how I should look at the stabilizer plot when...

It's been mentioned under this thread "Crazyflie spins uncontrollably" (https://forum.bitcraze.io/viewtopic.php?f=8&t=698&start=10): "Crazyflie 2.0 : It is a problem with the sensor chip (MPU9250) soldering. After some random flight time it looses communication with this chip ...