I just got a Brio 10 with the recommended setup: park 480, e flight 40A esc and a Tanic 1550 3S pack. I test flew it today and noticed that after the motor ran a while it tended to stiffen up a little almost as if something had expanded slightly. In other words, it doesn't spin as freely after the motor runs as it does before the motor runs. After a while it frees up again. Since I am new to electrics, particularly outrunners, I don't know if this is normal or not. Anyone seen this before?

Thanks,
Brian