T200 motor full of oxide

Hello to all.
I was working on the new updates of the BlueROV2 and I was testing all motors with the new feature from QGC, but one of them didn’t work and made a weird sound. It was the motor number 4.
So I disassembly all the motor and I found that the rotor was full of oxide but I don’t understand why becasuse these kind of motors are waterproof, Or that’s what the documentation says.
The thing is, this is not the first time I got this problem. This is the second motor that got full of oxide.
Can you help me? These are some pictures of the problem.
I6

Hi @danielcabas,

I have responded to your support email, please follow up with me there via email.

-Adam

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It’s a shame for the price …