Continued blank image generation

hi im using nano banana quite a bit and it repeatedly gives me a blank generation, i tell it i didn't receive an image and it apologises and tries again. most of the time it does it second try but the last few days its been terrible. im used up credits after credits without getting an image. im not asking it to do anything that would breach its nsfw limits/rules and i don't know what to do about it. when it's working properly it's absolutely amazing but im hesitant to use it because of the waste of credits