When the ball is in the outhole the switch completes a circuit to the bonus relay. The bonus relay holds itself on by a switch on itself. the motor is turning. Each 1/3 rev can only score 5 times because there are 5 cogs on motor level A. The motor is held on for another 1/3 rev for the next 5 bonus by a switch on itself. The bonus are given until the bonus unit switch is at 0. The bonus relay is then de-energized by a switch on motor 1A. Your bonus relay is not holding on long enough. Check its switches. It could be the switches at the bonus unit that are misadjusted stopping cycle early. I would also check the 1A switches.

O should be energized by a switch at bonus unit when at 0.