MAC hub motor: video clip, is something loose in there?

I had another thread where helpful forum members helped me through the famous hall sensor/phase leads combo hell.
But now I think the problem has been some mechanical problems from the start. Running unloaded, the motor draws a few amps. But there is something loose in there. Are there any seasoned gear hub motor users who can take a look at this clip and lead me in the right direction? It is a 10t MAC rear hub motor from EM3EV.
I am testing it with a controller from a BBSHD.
The voltmeter shows millivolts, and 75 millivolts equals 10 Amps. It is running at max 5 amps, until the rattle goes away and it draws around 2 amps at about full rpm.

http://www.torestabell.no/bikeproblems.mp4

And why is the power suddently cut, at near full rpm, without excessive current running?
Is the BBSHD controller made for a motor going much slower?

What's the ERPM limit of the controller?

You can calculate the ERPM of the motor; wheel speed times gearing ratio (internal planetary) times number of poles.
'
If the motor is higher ERPM than controller, you get "wierd" problems, because the controller can't keep up.