I just fixed this issue on my dad's game. The microswitch that the ball rolls on when it goes in the saucer scoop needed to be bent so it would activate the switch earlier. As it was it would only activate when the top of the wire was even with or just past the switch cutout so the saucers would often not be rewarded and it would count as a lock or sometimes get lost until a ball search brought it back up.

You can pull down on the switch and you'll hear a tiny click when it gets activated, just have to make sure it clicks before the top of the wire gets past the cutout. I think I removed the two screws and pulled out the switch to bend it but you might not have to. I took a pic when I was in there showing the switch you'll have to adjust. Hope this helps.
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