Dewalt 6.3 Amp Dry Wall Screwdriver "snap" Questions

...change it and how can I change from a Phillips to a nut driver tip. The bits are held by a spring snap ring that sometimes takes a lot of force to release. Spray a little bit of CRC226 into the ...

What's wrong with my screw gun when the bit keeps falling out when in use? The bit holder resides in the clutch housing which has a collar with a ball bearing that the notch in the bit holder snaps ...