Are you sure it's the motor? If so, is it signaling an error? (Not reading status back is in general a bad habit, because it makes debugging harder.)...
If the servo cannot get to the desired goal, it will generate an error to tell you this. The practice of "set a goal position that is not achievable"...
Not really. The main question is if you have command response turned on; if so, you may have to wait for a timeout if the servo didn't get the packet...
Synopsis:
I'm converting a 10-year-old RC car (a Nikko humvee truck) to a RoboMagellan competitor for 2013 RoboGames.
The main navigation is a pair of 1080p webcams set 40 degrees apart. Additional sensors and lost of computer power helps.