Very weird motor sound, need help fast

[Darwish]

Hi, I had a break from my P4P for about 4 months now. I went out today to fly, but it was some problems with the app. Got that fixed, and did a motor test inside without the props. Thank god there was an app problem, there is a very weird “vibrating, cracking noise” when the motors are slowing down to ground speed, I don’t know where it is coming from, but it looks like it’s coming from one of the motors. On the vid I tried to hold the motor on the speed were the noise was. Should I return it?

Video:

 

[Jayfdee]

Is it the ground sensors making the noise? Sorry VPS sensors, or whatever they call them.

 

[PaulSouthport]

Yep, it's the VPS sonar noise

 

[Darwish]

Yep, it's the VPS sonar noise

I feel vibration on the drone when it makes the sound. You sure? And should I send it in or is it a firmware issue?

 

[PaulSouthport]

I hear magnet clicks from the motors, they sound normal, and dolphin clicks from the VPS, also normal. I don't hear anything odd.