Played my machine for all of two hours total and this morning after about 10 min of play the fan kicks in really loudly and stays on. Even with the machine powered down it just runs and runs. Even after unplugging it for a while, as soon as its plugged in it kicks back on.
The sound is like a fan that's working hard. It doesn't have the additional clicking sound some users have complained about. But, it is really loud. Like the box fan I use for white noise while sleeping or a loud window unit air conditioner.