Yes I am thinking it is to do with the brake, and yes it does it with a bit in the chuck and the chuck tight. It does stop but not abruptly and it is more present in number 2 speed, I also notice that after four or five trigger depresses the speed drops to where nothing happens at all when the trigger is depressed, then after a few seconds this cycle starts over. This is present in number 1 speed as well as number 2. There is a good deal of wobble as well. Thinking could the chuck be lose on the drill, the screw inside is a torx I think? Will check that out later, hopping that isn't a warranty voiding thing. Or perhaps the drill is supposed to behave this way, as the motor isn't getting hot or anything? Also this is not drilling into anything but just into the air, will find a chunk of 2 by something somewhere and give drilling some holes into that a try.
Thanks again.
Sorry, 'egg on my face' the speed variance was just the battery I think as it doesn't do it with my other batteries. Didn't charge them as the I thought the fuel gauge said full but it was just barely charged. In my defense this is my first dealing with batteries with a charge gauge. Anyway the rattle is still there but starting to think it is common with this drill model.