I got a serious problem recently.
Few days ago, I was testing the six. But after about 10 minutes, one of the servos didn't work, it's broken. Then I replaced it with another servo. After about 5 minutes, one of the servos didn't work either (not the new one). This time I saw there were some gas coming out. I guess it was burned out. So I stop working on it.
Until today, my friend tested it again, the same thing happened. Therefore, I got three servos broken in a short time, I don't know why.
Forget to mention that I also have roli and jd, all of servos work fine but six.
Could anyone tell me what reason may cause that tragedy?