mj mod spinning the opposite way-why?

don't understand why it tends to spin backward...works fine for about 5 hrs. and then it just spin backward...
 
they aren't technically supposed to do that until the power turns on and off, but it is normal / supposed to happen.

that is why the "stopper" is supposed to be added to make sure that when it does reverse that it hits it and automatically reverses itself back to the correct way.
 
trimming the prop is usually the answer. after running for several hours it may be getting a little warm and looses power. I've had to trim the props and it usually solves the problem. Don't need to trim much...
 
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