To troubleshoot the issue of your Nerf N-Strike Elite Strongarm blaster auto-shooting when you pull back the slide to reload:
# Check for dart obstructions or improper placement in the dart chamber.
# Inspect the trigger mechanism for any damage or looseness.
# Clean the blaster, removing debris or dirt.
# Apply a small amount of lubricant to the slide mechanism and trigger.
# Ensure you are using fresh and undamaged darts.