I was drilling and it just stopped working, is there a safety switch or something

Try some DW 40 in the switch might have something init stopping it working might flush it out . if not you may have to take a part and have a look at the switch

The wires on the brushes sometimes shake loose , tool repair shop ,, or try it yourself ,, remember. Small parts ,, take pictures , tiny wires , may need to be soldered back in place ...

It sounds like you have a bad seal or O-ring. without takeing it apart and looking at it myself i cant tell you witch one is bad.if take it apart look the orings and seals over reall well and se if you can find any distorted places on them and then you can find a breakdown of the nailer and buy the seals or O-rings on this site.http://www.ereplacementparts.com/

if it is a round red button, twist it and pull out
because of safety reasons much of machinery now has this type of control switch so that in an emergency the button is pressed and the machine stops and it stays locked off

Your drill spindal might be freewilling, if it is your not ingaiging the drive. Some drill presses have a locking switch and or lever to ingage to make this work.

I don't thinkk you got the motor aligned in the housing right. It sounds like it's in a bind causing the battery to over amp which shuts it down. The litium batteries have curcuits that detect overloads so you don't damage the battery. There are alignment guides in the housing and on the motor to help get it right.

sometimes the motor of it have something called CARBON BRUSH inside,, try to look at it and replays a new one,,,,it is the most common trouble of a drill when its getting old olready but still can be fix by your self..good luck its not to hard..

sounds like you need a new switch.

Check to see if the fwrd/rvrse switch is fully engaged in one direction.

something is wrong. take it back if possible.