Hello from Colorado!
First, please stop watering with an ice cube. Think about it. These are tropical plants that live in a forest, deep where it doesn't go below 60 F likely. Now you are putting frozen water on their roots. Also, don't let them sit in standing water. They need to drain. We are most successful growing orchids when we fool them to think they are still in nature.
There are many reasons for bud blast. I usually just wait till they fall off in my fingers when it happens. I don't usually encounter bud blast unless it is on a 'new to my environment' orchid.
It is best to look at the roots and see if they are green before you go and water the Phal. And if they are green, they don't need watering. The orchid is likely in a clear plastic pot of some sort. Do you know the state of your roots? Healthy roots are required for healthy orchids.