Hi everyone. I need some feedback, maybe one of you experienced the same. I grounded my phantom since 10 days because in my last 3 flights the front LEFT motor was playing strange. It all started while in idle, minimun speed after start. The front motor after 1 minutes beginns with making a very short buzz, the light goes off for a split second and the propeller slows down. This happened every 5/10 seconds. Nonetheless I have flown it with caution and the phantom behaved without any problem. No sudden movement, no strange noise while flying. I carefully looked at the footage to see if I could get some hints. Nothing. Now I tested the propeller speeds with the laser. The back motors are running at the same speed (around 2400 rpm), the front right motor is runnig at 3300 rpm while the LEFT at 2300 rpm. So, I thought there is truly an issue here. I changed the esc first and noticed that the buzz disappeared nonetheless the speed is the same! So I ordered a new motor. Mounted the motor and nothing has changed. Still running the same speed. I boosted the speed to around 4500 rpm on the right front propeller and noticed that the left was turning at a slower speed but the difference appeared to be much less (maybe 400 rpm). So now I’m really confused. I don’t feel comfortable to fly until I understand what is going on. All 4 motors after testing were warm the same. I’m wondering if the problem could be on some misbehaviour of the Naza module. As long as it’s in idle things seem not ok. I also turned 180° the phantom to see if maybe there would be a change in speed. Moreorless it’s the same. I’m really curios if any one of you measured the rpm of the motors while in idle. If not maybe you should. Any suggestions??