About two months after I got my banana BP I had the same thing happen. She was out looking hungry and was very eager to strike at the rat... but after a few minutes she would drop the rat and look at me expecting another rat to fly into the cage. I left the rat overnight and she never ate it.
The next week the exact same thing happened. Eager to strike but wouldn't eat. I left the rat in the cage again and two hours later it was gone, she finally decided to eat.
After that everything went back to normal, late night feeding. She would strike and eat right away. I have no idea why she did that.. but it passed and I've had no issues since.
All that said... hopefully it's the same deal with you and things will go back to normal soon.