have heard young begging in the past then a few days later, parents would be building another nest

heard some young about 10 days ago, didnt want to get my hopes up. heard them yesterday, big strong calls, sounded like at least 3 young, cant help but be VERY anxious!! hoping to finally have some good news from these birds.
they get everything i have the time to give on a daily basis (mealies, lebanese cucumber, green grasses etc etc) but has anyone had a similar experience with diamonds abandoning nests for no particular reason (have read a couple of articles with similar stories)? more importantly, and my main question, any kind of solution?! finding it incredibly frustrating as a breeder and sad as an animal lover to lose young repeatedly.