I start with changing all the transmitter optos on the transmitter trough opto board. That is where majority of the issues start on this game.

No. Mine has the dead world mod andhas no random failures

From Pinbits website.

Troubleshooting Notes
The locking software is very sensitive to hardware errors in the game. A few typical malfunctions and their fixes are as follows:

Diverter does not load the ring when planet lock is available
- Check ramp entrance opto
- Check diverter

Multiball does not have all 6 balls
- Insufficient balls in the machine
- Trough divots holding up the balls (gently file and sand the trough ball lane to remove them)
- Bad opto transmitters or receivers in the trough (check trough optos in swicth test)

Game keeps shooting extra balls in multiball, and ends ball with balls still on the playfield
- Check crane exit opto
- Check that the ball exits through the crane exit opto

The crane opto has a relatively long gap; cleaning the transmitter and receiver can help.

https://www.pinbits.com/index.php?main_page=product_info&cPath=13_8&products_id=136&zenid=b9c7f3f72472708939fa35ed69d9d1c2