Phantom making strange whistling noise & Bee attack video

Funny you mention temps. My left rear motor always ran hot. When I replaced it, it still runs hot. I thought it was a bearing issue, but I now believe it to be a balance issue with my cheap Chinese gimbal. Hopefully a transmitter mounted to the opposite side will help.
 
Possibly, and good hypothesis.
 
I personally can't rule it or out, but for it to fly correctly otherwise would have me looking elsewhere. That's me, YMMV ;).
 

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